1 00:00:07,460 --> 00:00:11,650 we have here if you have heterogeneous 2 00:00:11,650 --> 00:00:11,660 we have here if you have heterogeneous 3 00:00:11,660 --> 00:00:13,750 we have here if you have heterogeneous system in equilibrium what is that means 4 00:00:13,750 --> 00:00:13,760 system in equilibrium what is that means 5 00:00:13,760 --> 00:00:14,520 system in equilibrium what is that means that 6 00:00:14,520 --> 00:00:14,530 that 7 00:00:14,530 --> 00:00:16,950 that some of the reactants or the products 8 00:00:16,950 --> 00:00:16,960 some of the reactants or the products 9 00:00:16,960 --> 00:00:20,880 some of the reactants or the products are at different phases when we simply 10 00:00:20,880 --> 00:00:20,890 are at different phases when we simply 11 00:00:20,890 --> 00:00:23,400 are at different phases when we simply say different phases like solids 12 00:00:23,400 --> 00:00:23,410 say different phases like solids 13 00:00:23,410 --> 00:00:27,990 say different phases like solids - solutions or liquids these are simply 14 00:00:27,990 --> 00:00:28,000 - solutions or liquids these are simply 15 00:00:28,000 --> 00:00:30,570 - solutions or liquids these are simply if you have solids and the gas that 16 00:00:30,570 --> 00:00:30,580 if you have solids and the gas that 17 00:00:30,580 --> 00:00:33,390 if you have solids and the gas that would be heterogeneous or liquid and 18 00:00:33,390 --> 00:00:33,400 would be heterogeneous or liquid and 19 00:00:33,400 --> 00:00:37,020 would be heterogeneous or liquid and will be written as such that you leave 20 00:00:37,020 --> 00:00:37,030 will be written as such that you leave 21 00:00:37,030 --> 00:00:40,979 will be written as such that you leave out the solids or pure liquids that 22 00:00:40,979 --> 00:00:40,989 out the solids or pure liquids that 23 00:00:40,989 --> 00:00:43,650 out the solids or pure liquids that involved in the equilibrium expression 24 00:00:43,650 --> 00:00:43,660 involved in the equilibrium expression 25 00:00:43,660 --> 00:00:49,170 involved in the equilibrium expression and as we explained last time we don't 26 00:00:49,170 --> 00:00:49,180 and as we explained last time we don't 27 00:00:49,180 --> 00:00:52,369 and as we explained last time we don't really leave them out because their 28 00:00:52,369 --> 00:00:52,379 really leave them out because their 29 00:00:52,379 --> 00:00:54,709 really leave them out because their concentrations are one Wooler 30 00:00:54,709 --> 00:00:54,719 concentrations are one Wooler 31 00:00:54,719 --> 00:00:57,060 concentrations are one Wooler because their concentrations are 32 00:00:57,060 --> 00:00:57,070 because their concentrations are 33 00:00:57,070 --> 00:01:00,389 because their concentrations are constant in the solid state or constant 34 00:01:00,389 --> 00:01:00,399 constant in the solid state or constant 35 00:01:00,399 --> 00:01:03,029 constant in the solid state or constant in liquid state but if you have 36 00:01:03,029 --> 00:01:03,039 in liquid state but if you have 37 00:01:03,039 --> 00:01:05,670 in liquid state but if you have solutions molar concentrations in fact 38 00:01:05,670 --> 00:01:05,680 solutions molar concentrations in fact 39 00:01:05,680 --> 00:01:08,370 solutions molar concentrations in fact in solutions they change those are the 40 00:01:08,370 --> 00:01:08,380 in solutions they change those are the 41 00:01:08,380 --> 00:01:11,130 in solutions they change those are the one only that we will have taken into 42 00:01:11,130 --> 00:01:11,140 one only that we will have taken into 43 00:01:11,140 --> 00:01:13,380 one only that we will have taken into account and also the gases if they have 44 00:01:13,380 --> 00:01:13,390 account and also the gases if they have 45 00:01:13,390 --> 00:01:15,300 account and also the gases if they have a gas phase you should take account of 46 00:01:15,300 --> 00:01:15,310 a gas phase you should take account of 47 00:01:15,310 --> 00:01:18,029 a gas phase you should take account of gases to such an equilibrium here 48 00:01:18,029 --> 00:01:18,039 gases to such an equilibrium here 49 00:01:18,039 --> 00:01:19,620 gases to such an equilibrium here decomposition is of the calcium 50 00:01:19,620 --> 00:01:19,630 decomposition is of the calcium 51 00:01:19,630 --> 00:01:22,789 decomposition is of the calcium carbonate given solid calcium carbonate 52 00:01:22,789 --> 00:01:22,799 carbonate given solid calcium carbonate 53 00:01:22,799 --> 00:01:25,800 carbonate given solid calcium carbonate given calcium oxide solid and carbon 54 00:01:25,800 --> 00:01:25,810 given calcium oxide solid and carbon 55 00:01:25,810 --> 00:01:28,410 given calcium oxide solid and carbon dioxide gas if you write down the K sub 56 00:01:28,410 --> 00:01:28,420 dioxide gas if you write down the K sub 57 00:01:28,420 --> 00:01:31,289 dioxide gas if you write down the K sub C for this it would be directly equal to 58 00:01:31,289 --> 00:01:31,299 C for this it would be directly equal to 59 00:01:31,299 --> 00:01:33,320 C for this it would be directly equal to the concentrations of carbon dioxide 60 00:01:33,320 --> 00:01:33,330 the concentrations of carbon dioxide 61 00:01:33,330 --> 00:01:37,070 the concentrations of carbon dioxide above the solid calcium carbonate and 62 00:01:37,070 --> 00:01:37,080 above the solid calcium carbonate and 63 00:01:37,080 --> 00:01:40,710 above the solid calcium carbonate and the KP if we write down the KP for this 64 00:01:40,710 --> 00:01:40,720 the KP if we write down the KP for this 65 00:01:40,720 --> 00:01:43,350 the KP if we write down the KP for this reaction again it would be equal to the 66 00:01:43,350 --> 00:01:43,360 reaction again it would be equal to the 67 00:01:43,360 --> 00:01:45,899 reaction again it would be equal to the pressure partial pressure of the carbon 68 00:01:45,899 --> 00:01:45,909 pressure partial pressure of the carbon 69 00:01:45,909 --> 00:01:49,469 pressure partial pressure of the carbon dioxide again at equilibrium again 70 00:01:49,469 --> 00:01:49,479 dioxide again at equilibrium again 71 00:01:49,479 --> 00:01:51,179 dioxide again at equilibrium again remember we don't write down the 72 00:01:51,179 --> 00:01:51,189 remember we don't write down the 73 00:01:51,189 --> 00:01:53,969 remember we don't write down the concentrations of these solids not the 74 00:01:53,969 --> 00:01:53,979 concentrations of these solids not the 75 00:01:53,979 --> 00:01:55,890 concentrations of these solids not the reason that their concentrations are 76 00:01:55,890 --> 00:01:55,900 reason that their concentrations are 77 00:01:55,900 --> 00:01:59,069 reason that their concentrations are equal to one but they are constant they 78 00:01:59,069 --> 00:01:59,079 equal to one but they are constant they 79 00:01:59,079 --> 00:02:01,410 equal to one but they are constant they actually included in this constant pair 80 00:02:01,410 --> 00:02:01,420 actually included in this constant pair 81 00:02:01,420 --> 00:02:06,499 actually included in this constant pair so we just give one equilibrium constant 82 00:02:06,499 --> 00:02:06,509 so we just give one equilibrium constant 83 00:02:06,509 --> 00:02:10,230 so we just give one equilibrium constant okay oh we can't 84 00:02:10,230 --> 00:02:10,240 okay oh we can't 85 00:02:10,240 --> 00:02:14,660 okay oh we can't concentrations again we will work out 86 00:02:14,660 --> 00:02:14,670 concentrations again we will work out 87 00:02:14,670 --> 00:02:18,420 concentrations again we will work out using an example first it says tabulate 88 00:02:18,420 --> 00:02:18,430 using an example first it says tabulate 89 00:02:18,430 --> 00:02:20,340 using an example first it says tabulate all known initial and equilibrium 90 00:02:20,340 --> 00:02:20,350 all known initial and equilibrium 91 00:02:20,350 --> 00:02:22,530 all known initial and equilibrium concentrations you just follow these 92 00:02:22,530 --> 00:02:22,540 concentrations you just follow these 93 00:02:22,540 --> 00:02:25,320 concentrations you just follow these steps it would be very easy to carry out 94 00:02:25,320 --> 00:02:25,330 steps it would be very easy to carry out 95 00:02:25,330 --> 00:02:27,420 steps it would be very easy to carry out and find out the concentrations at the 96 00:02:27,420 --> 00:02:27,430 and find out the concentrations at the 97 00:02:27,430 --> 00:02:33,200 and find out the concentrations at the equilibrium concentrations are known 98 00:02:33,200 --> 00:02:33,210 equilibrium concentrations are known 99 00:02:33,210 --> 00:02:37,260 equilibrium concentrations are known calculate the change says and use the 100 00:02:37,260 --> 00:02:37,270 calculate the change says and use the 101 00:02:37,270 --> 00:02:39,360 calculate the change says and use the balanced equation to find the change for 102 00:02:39,360 --> 00:02:39,370 balanced equation to find the change for 103 00:02:39,370 --> 00:02:43,230 balanced equation to find the change for all other reactants and products use the 104 00:02:43,230 --> 00:02:43,240 all other reactants and products use the 105 00:02:43,240 --> 00:02:45,870 all other reactants and products use the balanced equations and write down the 106 00:02:45,870 --> 00:02:45,880 balanced equations and write down the 107 00:02:45,880 --> 00:02:48,060 balanced equations and write down the concentration changes for all others 108 00:02:48,060 --> 00:02:48,070 concentration changes for all others 109 00:02:48,070 --> 00:02:51,270 concentration changes for all others again that involved in the equilibrium 110 00:02:51,270 --> 00:02:51,280 again that involved in the equilibrium 111 00:02:51,280 --> 00:02:53,670 again that involved in the equilibrium and the fourth step is use the initial 112 00:02:53,670 --> 00:02:53,680 and the fourth step is use the initial 113 00:02:53,680 --> 00:02:55,680 and the fourth step is use the initial concentrations and changes to find 114 00:02:55,680 --> 00:02:55,690 concentrations and changes to find 115 00:02:55,690 --> 00:02:58,020 concentrations and changes to find including concentrations of all species 116 00:02:58,020 --> 00:02:58,030 including concentrations of all species 117 00:02:58,030 --> 00:03:00,420 including concentrations of all species and the last step is calculate the 118 00:03:00,420 --> 00:03:00,430 and the last step is calculate the 119 00:03:00,430 --> 00:03:02,100 and the last step is calculate the equilibrium constant using the 120 00:03:02,100 --> 00:03:02,110 equilibrium constant using the 121 00:03:02,110 --> 00:03:05,250 equilibrium constant using the equilibrium concentrations again if we 122 00:03:05,250 --> 00:03:05,260 equilibrium concentrations again if we 123 00:03:05,260 --> 00:03:07,380 equilibrium concentrations again if we know the equilibrium concentrations we 124 00:03:07,380 --> 00:03:07,390 know the equilibrium concentrations we 125 00:03:07,390 --> 00:03:08,580 know the equilibrium concentrations we can calculate the equilibrium constant 126 00:03:08,580 --> 00:03:08,590 can calculate the equilibrium constant 127 00:03:08,590 --> 00:03:11,270 can calculate the equilibrium constant as we said before or if you know the 128 00:03:11,270 --> 00:03:11,280 as we said before or if you know the 129 00:03:11,280 --> 00:03:14,070 as we said before or if you know the equilibrium constant and know the 130 00:03:14,070 --> 00:03:14,080 equilibrium constant and know the 131 00:03:14,080 --> 00:03:16,740 equilibrium constant and know the initial concentrations for example then 132 00:03:16,740 --> 00:03:16,750 initial concentrations for example then 133 00:03:16,750 --> 00:03:18,540 initial concentrations for example then we can calculate the concentrations of 134 00:03:18,540 --> 00:03:18,550 we can calculate the concentrations of 135 00:03:18,550 --> 00:03:23,250 we can calculate the concentrations of all the species okay let's look at the 136 00:03:23,250 --> 00:03:23,260 all the species okay let's look at the 137 00:03:23,260 --> 00:03:26,460 all the species okay let's look at the example here a closed system initially 138 00:03:26,460 --> 00:03:26,470 example here a closed system initially 139 00:03:26,470 --> 00:03:29,820 example here a closed system initially contained in that mole simply hydrogen 140 00:03:29,820 --> 00:03:29,830 contained in that mole simply hydrogen 141 00:03:29,830 --> 00:03:37,110 contained in that mole simply hydrogen gas and that mole of iodine at 448 again 142 00:03:37,110 --> 00:03:37,120 gas and that mole of iodine at 448 again 143 00:03:37,120 --> 00:03:39,900 gas and that mole of iodine at 448 again degree centigrade allowed to reach the 144 00:03:39,900 --> 00:03:39,910 degree centigrade allowed to reach the 145 00:03:39,910 --> 00:03:45,750 degree centigrade allowed to reach the equilibrium the concentrations of the H 146 00:03:45,750 --> 00:03:45,760 equilibrium the concentrations of the H 147 00:03:45,760 --> 00:03:49,410 equilibrium the concentrations of the H I is one point 87 times 10 to the minus 148 00:03:49,410 --> 00:03:49,420 I is one point 87 times 10 to the minus 149 00:03:49,420 --> 00:03:53,850 I is one point 87 times 10 to the minus 3 molar calculate the case of C at 448 150 00:03:53,850 --> 00:03:53,860 3 molar calculate the case of C at 448 151 00:03:53,860 --> 00:03:56,430 3 molar calculate the case of C at 448 degree centigrade for the reaction 152 00:03:56,430 --> 00:03:56,440 degree centigrade for the reaction 153 00:03:56,440 --> 00:03:58,770 degree centigrade for the reaction taking place which is the equilibrium 154 00:03:58,770 --> 00:03:58,780 taking place which is the equilibrium 155 00:03:58,780 --> 00:04:00,240 taking place which is the equilibrium reaction this is actually the 156 00:04:00,240 --> 00:04:00,250 reaction this is actually the 157 00:04:00,250 --> 00:04:02,040 reaction this is actually the equilibrium reaction and we will 158 00:04:02,040 --> 00:04:02,050 equilibrium reaction and we will 159 00:04:02,050 --> 00:04:03,510 equilibrium reaction and we will calculate the equilibrium constant for 160 00:04:03,510 --> 00:04:03,520 calculate the equilibrium constant for 161 00:04:03,520 --> 00:04:08,220 calculate the equilibrium constant for this now what given again the initial 162 00:04:08,220 --> 00:04:08,230 this now what given again the initial 163 00:04:08,230 --> 00:04:11,820 this now what given again the initial concentration of the hydrogen and iodine 164 00:04:11,820 --> 00:04:11,830 concentration of the hydrogen and iodine 165 00:04:11,830 --> 00:04:15,900 concentration of the hydrogen and iodine both are in gaseous form now the 166 00:04:15,900 --> 00:04:15,910 both are in gaseous form now the 167 00:04:15,910 --> 00:04:18,390 both are in gaseous form now the temperature is also given and we asked 168 00:04:18,390 --> 00:04:18,400 temperature is also given and we asked 169 00:04:18,400 --> 00:04:20,990 temperature is also given and we asked to calculate the temperature at this 170 00:04:20,990 --> 00:04:21,000 to calculate the temperature at this 171 00:04:21,000 --> 00:04:23,310 to calculate the temperature at this actually the equilibrium constant at 172 00:04:23,310 --> 00:04:23,320 actually the equilibrium constant at 173 00:04:23,320 --> 00:04:24,270 actually the equilibrium constant at this temperature 174 00:04:24,270 --> 00:04:24,280 this temperature 175 00:04:24,280 --> 00:04:27,450 this temperature this reaction again the only effect of 176 00:04:27,450 --> 00:04:27,460 this reaction again the only effect of 177 00:04:27,460 --> 00:04:29,730 this reaction again the only effect of the temperature is remember when the 178 00:04:29,730 --> 00:04:29,740 the temperature is remember when the 179 00:04:29,740 --> 00:04:30,960 the temperature is remember when the temperature changes the equivalent 180 00:04:30,960 --> 00:04:30,970 temperature changes the equivalent 181 00:04:30,970 --> 00:04:32,610 temperature changes the equivalent constant is changing we're not going to 182 00:04:32,610 --> 00:04:32,620 constant is changing we're not going to 183 00:04:32,620 --> 00:04:34,710 constant is changing we're not going to use the temperature here to calculate 184 00:04:34,710 --> 00:04:34,720 use the temperature here to calculate 185 00:04:34,720 --> 00:04:36,930 use the temperature here to calculate the equilibrium constant but we have to 186 00:04:36,930 --> 00:04:36,940 the equilibrium constant but we have to 187 00:04:36,940 --> 00:04:39,360 the equilibrium constant but we have to report the equilibrium constant at that 188 00:04:39,360 --> 00:04:39,370 report the equilibrium constant at that 189 00:04:39,370 --> 00:04:41,310 report the equilibrium constant at that specific temperature actually that's 190 00:04:41,310 --> 00:04:41,320 specific temperature actually that's 191 00:04:41,320 --> 00:04:44,640 specific temperature actually that's important okay let's look at the next 192 00:04:44,640 --> 00:04:44,650 important okay let's look at the next 193 00:04:44,650 --> 00:04:46,890 important okay let's look at the next step again here this is a this is very 194 00:04:46,890 --> 00:04:46,900 step again here this is a this is very 195 00:04:46,900 --> 00:04:50,460 step again here this is a this is very easy but if you just use step by step 196 00:04:50,460 --> 00:04:50,470 easy but if you just use step by step 197 00:04:50,470 --> 00:04:55,560 easy but if you just use step by step and solve your problem like we do here 198 00:04:55,560 --> 00:04:55,570 and solve your problem like we do here 199 00:04:55,570 --> 00:04:57,600 and solve your problem like we do here in fact it would be very easy so you 200 00:04:57,600 --> 00:04:57,610 in fact it would be very easy so you 201 00:04:57,610 --> 00:05:00,300 in fact it would be very easy so you have the equations actually balance 202 00:05:00,300 --> 00:05:00,310 have the equations actually balance 203 00:05:00,310 --> 00:05:04,140 have the equations actually balance equations then you have here a table 204 00:05:04,140 --> 00:05:04,150 equations then you have here a table 205 00:05:04,150 --> 00:05:06,210 equations then you have here a table which says the initially that means 206 00:05:06,210 --> 00:05:06,220 which says the initially that means 207 00:05:06,220 --> 00:05:08,480 which says the initially that means these are simply we call the initial 208 00:05:08,480 --> 00:05:08,490 these are simply we call the initial 209 00:05:08,490 --> 00:05:11,640 these are simply we call the initial concentration of the reactants or 210 00:05:11,640 --> 00:05:11,650 concentration of the reactants or 211 00:05:11,650 --> 00:05:13,440 concentration of the reactants or product whatever we have the species 212 00:05:13,440 --> 00:05:13,450 product whatever we have the species 213 00:05:13,450 --> 00:05:16,770 product whatever we have the species that means before we simply before the 214 00:05:16,770 --> 00:05:16,780 that means before we simply before the 215 00:05:16,780 --> 00:05:18,060 that means before we simply before the system reaches to the equilibrium an 216 00:05:18,060 --> 00:05:18,070 system reaches to the equilibrium an 217 00:05:18,070 --> 00:05:20,250 system reaches to the equilibrium an issue we start with that concentrations 218 00:05:20,250 --> 00:05:20,260 issue we start with that concentrations 219 00:05:20,260 --> 00:05:22,950 issue we start with that concentrations in this case the concentrations of the 220 00:05:22,950 --> 00:05:22,960 in this case the concentrations of the 221 00:05:22,960 --> 00:05:27,210 in this case the concentrations of the hydrogen in fact gas is 1 10 to the 222 00:05:27,210 --> 00:05:27,220 hydrogen in fact gas is 1 10 to the 223 00:05:27,220 --> 00:05:29,520 hydrogen in fact gas is 1 10 to the minus 3 molar and the concentrations of 224 00:05:29,520 --> 00:05:29,530 minus 3 molar and the concentrations of 225 00:05:29,530 --> 00:05:32,850 minus 3 molar and the concentrations of i2 is again this molar two times at the 226 00:05:32,850 --> 00:05:32,860 i2 is again this molar two times at the 227 00:05:32,860 --> 00:05:35,070 i2 is again this molar two times at the minus 3 molar and the initial 228 00:05:35,070 --> 00:05:35,080 minus 3 molar and the initial 229 00:05:35,080 --> 00:05:38,400 minus 3 molar and the initial concentrations of H I is zero right 230 00:05:38,400 --> 00:05:38,410 concentrations of H I is zero right 231 00:05:38,410 --> 00:05:40,830 concentrations of H I is zero right because we only start with the hydrogen 232 00:05:40,830 --> 00:05:40,840 because we only start with the hydrogen 233 00:05:40,840 --> 00:05:43,140 because we only start with the hydrogen and the iodine again in the gas phase 234 00:05:43,140 --> 00:05:43,150 and the iodine again in the gas phase 235 00:05:43,150 --> 00:05:47,130 and the iodine again in the gas phase now changes we will put the changes here 236 00:05:47,130 --> 00:05:47,140 now changes we will put the changes here 237 00:05:47,140 --> 00:05:51,390 now changes we will put the changes here again it says that the final 238 00:05:51,390 --> 00:05:51,400 again it says that the final 239 00:05:51,400 --> 00:05:55,409 again it says that the final concentrations of the H I is one point 240 00:05:55,409 --> 00:05:55,419 concentrations of the H I is one point 241 00:05:55,419 --> 00:05:57,330 concentrations of the H I is one point eighty seven times 10 to the minus 3 242 00:05:57,330 --> 00:05:57,340 eighty seven times 10 to the minus 3 243 00:05:57,340 --> 00:06:01,110 eighty seven times 10 to the minus 3 molar this is the H I increased by one 244 00:06:01,110 --> 00:06:01,120 molar this is the H I increased by one 245 00:06:01,120 --> 00:06:02,700 molar this is the H I increased by one point eight seven times 10 to the minus 246 00:06:02,700 --> 00:06:02,710 point eight seven times 10 to the minus 247 00:06:02,710 --> 00:06:06,360 point eight seven times 10 to the minus 3 molar and then the other 248 00:06:06,360 --> 00:06:06,370 3 molar and then the other 249 00:06:06,370 --> 00:06:08,930 3 molar and then the other concentrations let's look at the 250 00:06:08,930 --> 00:06:08,940 concentrations let's look at the 251 00:06:08,940 --> 00:06:12,810 concentrations let's look at the concentrations of the others actually b9 252 00:06:12,810 --> 00:06:12,820 concentrations of the others actually b9 253 00:06:12,820 --> 00:06:15,000 concentrations of the others actually b9 35 times 10 to the minus 5 and this is 254 00:06:15,000 --> 00:06:15,010 35 times 10 to the minus 5 and this is 255 00:06:15,010 --> 00:06:19,440 35 times 10 to the minus 5 and this is 935 times 10 to minus 4 and at 256 00:06:19,440 --> 00:06:19,450 935 times 10 to minus 4 and at 257 00:06:19,450 --> 00:06:24,750 935 times 10 to minus 4 and at equilibrium again you calculate that the 258 00:06:24,750 --> 00:06:24,760 equilibrium again you calculate that the 259 00:06:24,760 --> 00:06:26,280 equilibrium again you calculate that the equilibrium concentration will be six 260 00:06:26,280 --> 00:06:26,290 equilibrium concentration will be six 261 00:06:26,290 --> 00:06:29,750 equilibrium concentration will be six point five times ten to minus five and 262 00:06:29,750 --> 00:06:29,760 point five times ten to minus five and 263 00:06:29,760 --> 00:06:32,370 point five times ten to minus five and 106 five times seven minus three and 264 00:06:32,370 --> 00:06:32,380 106 five times seven minus three and 265 00:06:32,380 --> 00:06:35,760 106 five times seven minus three and this is given again here this is given 266 00:06:35,760 --> 00:06:35,770 this is given again here this is given 267 00:06:35,770 --> 00:06:37,440 this is given again here this is given so we calculate the equilibrium constant 268 00:06:37,440 --> 00:06:37,450 so we calculate the equilibrium constant 269 00:06:37,450 --> 00:06:38,110 so we calculate the equilibrium constant but 270 00:06:38,110 --> 00:06:38,120 but 271 00:06:38,120 --> 00:06:41,469 but look at let's go to the previous slide 272 00:06:41,469 --> 00:06:41,479 look at let's go to the previous slide 273 00:06:41,479 --> 00:06:52,439 look at let's go to the previous slide here so we have this h2 gas and plus i2 274 00:06:52,439 --> 00:06:52,449 here so we have this h2 gas and plus i2 275 00:06:52,449 --> 00:06:58,830 here so we have this h2 gas and plus i2 gas and equilibrium to hydrogen iodide 276 00:06:58,830 --> 00:06:58,840 gas and equilibrium to hydrogen iodide 277 00:06:58,840 --> 00:07:03,670 gas and equilibrium to hydrogen iodide again gas and what is actually given us 278 00:07:03,670 --> 00:07:03,680 again gas and what is actually given us 279 00:07:03,680 --> 00:07:06,280 again gas and what is actually given us the initial concentrations of these 280 00:07:06,280 --> 00:07:06,290 the initial concentrations of these 281 00:07:06,290 --> 00:07:10,420 the initial concentrations of these species and the concentrations of H I at 282 00:07:10,420 --> 00:07:10,430 species and the concentrations of H I at 283 00:07:10,430 --> 00:07:12,570 species and the concentrations of H I at equilibrium again you see it says 284 00:07:12,570 --> 00:07:12,580 equilibrium again you see it says 285 00:07:12,580 --> 00:07:15,040 equilibrium again you see it says analysis of the equilibrium mixture 286 00:07:15,040 --> 00:07:15,050 analysis of the equilibrium mixture 287 00:07:15,050 --> 00:07:17,260 analysis of the equilibrium mixture shows that the concentrations of H I is 288 00:07:17,260 --> 00:07:17,270 shows that the concentrations of H I is 289 00:07:17,270 --> 00:07:21,520 shows that the concentrations of H I is 187 10 to the minus 3 so if we just go 290 00:07:21,520 --> 00:07:21,530 187 10 to the minus 3 so if we just go 291 00:07:21,530 --> 00:07:25,210 187 10 to the minus 3 so if we just go to the next here the concentrations of 292 00:07:25,210 --> 00:07:25,220 to the next here the concentrations of 293 00:07:25,220 --> 00:07:31,180 to the next here the concentrations of this is 1.8 7 times 10 to the minus 3 294 00:07:31,180 --> 00:07:31,190 this is 1.8 7 times 10 to the minus 3 295 00:07:31,190 --> 00:07:32,830 this is 1.8 7 times 10 to the minus 3 molar 296 00:07:32,830 --> 00:07:32,840 molar 297 00:07:32,840 --> 00:07:40,770 molar I should probably that's okay and now 298 00:07:40,770 --> 00:07:40,780 I should probably that's okay and now 299 00:07:40,780 --> 00:07:43,900 I should probably that's okay and now once we I know the concentrations of 300 00:07:43,900 --> 00:07:43,910 once we I know the concentrations of 301 00:07:43,910 --> 00:07:48,040 once we I know the concentrations of this in 8 1 8 7 times 10 to the minus 3 302 00:07:48,040 --> 00:07:48,050 this in 8 1 8 7 times 10 to the minus 3 303 00:07:48,050 --> 00:07:50,379 this in 8 1 8 7 times 10 to the minus 3 molar initial concentrations of this is 304 00:07:50,379 --> 00:07:50,389 molar initial concentrations of this is 305 00:07:50,389 --> 00:07:55,779 molar initial concentrations of this is given as 1 point 0 0 0 times 10 to the 306 00:07:55,779 --> 00:07:55,789 given as 1 point 0 0 0 times 10 to the 307 00:07:55,789 --> 00:08:00,969 given as 1 point 0 0 0 times 10 to the minus 3 molar right and this one is 2 308 00:08:00,969 --> 00:08:00,979 minus 3 molar right and this one is 2 309 00:08:00,979 --> 00:08:06,810 minus 3 molar right and this one is 2 point 0 0 times 10 to the minus 3 molar 310 00:08:06,810 --> 00:08:06,820 point 0 0 times 10 to the minus 3 molar 311 00:08:06,820 --> 00:08:11,710 point 0 0 times 10 to the minus 3 molar again now if this is the let's put it 312 00:08:11,710 --> 00:08:11,720 again now if this is the let's put it 313 00:08:11,720 --> 00:08:18,670 again now if this is the let's put it over here at the beginning this is 0 314 00:08:18,670 --> 00:08:18,680 over here at the beginning this is 0 315 00:08:18,680 --> 00:08:22,950 over here at the beginning this is 0 initial concentrations and the change of 316 00:08:22,950 --> 00:08:22,960 initial concentrations and the change of 317 00:08:22,960 --> 00:08:28,800 initial concentrations and the change of the concentrations is given for the 318 00:08:28,800 --> 00:08:28,810 the concentrations is given for the 319 00:08:28,810 --> 00:08:32,290 the concentrations is given for the actually H I and that is I can write 320 00:08:32,290 --> 00:08:32,300 actually H I and that is I can write 321 00:08:32,300 --> 00:08:37,420 actually H I and that is I can write down here 1 point 8 7 times 10 to the 322 00:08:37,420 --> 00:08:37,430 down here 1 point 8 7 times 10 to the 323 00:08:37,430 --> 00:08:43,269 down here 1 point 8 7 times 10 to the minus 3 molar then I can calculate the 324 00:08:43,269 --> 00:08:43,279 minus 3 molar then I can calculate the 325 00:08:43,279 --> 00:08:46,180 minus 3 molar then I can calculate the concentrations of these the change of 326 00:08:46,180 --> 00:08:46,190 concentrations of these the change of 327 00:08:46,190 --> 00:08:47,860 concentrations of these the change of the concentrations of these here that 328 00:08:47,860 --> 00:08:47,870 the concentrations of these here that 329 00:08:47,870 --> 00:08:50,350 the concentrations of these here that would be equal to what let's let's put 330 00:08:50,350 --> 00:08:50,360 would be equal to what let's let's put 331 00:08:50,360 --> 00:08:54,120 would be equal to what let's let's put that here 332 00:08:54,120 --> 00:08:54,130 333 00:08:54,130 --> 00:09:01,509 change and equilibrium right and I will 334 00:09:01,509 --> 00:09:01,519 change and equilibrium right and I will 335 00:09:01,519 --> 00:09:04,690 change and equilibrium right and I will put over here equilibrium 87 times 10 to 336 00:09:04,690 --> 00:09:04,700 put over here equilibrium 87 times 10 to 337 00:09:04,700 --> 00:09:07,329 put over here equilibrium 87 times 10 to the minus 3 molar also at equilibrium is 338 00:09:07,329 --> 00:09:07,339 the minus 3 molar also at equilibrium is 339 00:09:07,339 --> 00:09:11,350 the minus 3 molar also at equilibrium is given now how once actually this is 340 00:09:11,350 --> 00:09:11,360 given now how once actually this is 341 00:09:11,360 --> 00:09:14,019 given now how once actually this is given and those concentrations are given 342 00:09:14,019 --> 00:09:14,029 given and those concentrations are given 343 00:09:14,029 --> 00:09:16,120 given and those concentrations are given I can calculate the change here the 344 00:09:16,120 --> 00:09:16,130 I can calculate the change here the 345 00:09:16,130 --> 00:09:20,380 I can calculate the change here the change here will be what we respect to 346 00:09:20,380 --> 00:09:20,390 change here will be what we respect to 347 00:09:20,390 --> 00:09:25,949 change here will be what we respect to this it will be half of the H I 348 00:09:25,949 --> 00:09:25,959 this it will be half of the H I 349 00:09:25,959 --> 00:09:28,980 this it will be half of the H I concentration at equilibrium right why 350 00:09:28,980 --> 00:09:28,990 concentration at equilibrium right why 351 00:09:28,990 --> 00:09:32,319 concentration at equilibrium right why because this reaction simply says that 352 00:09:32,319 --> 00:09:32,329 because this reaction simply says that 353 00:09:32,329 --> 00:09:35,910 because this reaction simply says that when one mole of H I 354 00:09:35,910 --> 00:09:35,920 when one mole of H I 355 00:09:35,920 --> 00:09:40,780 when one mole of H I reacts half am actually 2 moles of H I 356 00:09:40,780 --> 00:09:40,790 reacts half am actually 2 moles of H I 357 00:09:40,790 --> 00:09:43,750 reacts half am actually 2 moles of H I will be produced when one mole of h2 358 00:09:43,750 --> 00:09:43,760 will be produced when one mole of h2 359 00:09:43,760 --> 00:09:47,350 will be produced when one mole of h2 reacts and this means two moles of H I 360 00:09:47,350 --> 00:09:47,360 reacts and this means two moles of H I 361 00:09:47,360 --> 00:09:49,750 reacts and this means two moles of H I will be produced and the same thing is 362 00:09:49,750 --> 00:09:49,760 will be produced and the same thing is 363 00:09:49,760 --> 00:09:53,850 will be produced and the same thing is here when mole one mole of iodine 364 00:09:53,850 --> 00:09:53,860 here when mole one mole of iodine 365 00:09:53,860 --> 00:09:57,220 here when mole one mole of iodine reacted then I will have two times of 366 00:09:57,220 --> 00:09:57,230 reacted then I will have two times of 367 00:09:57,230 --> 00:10:00,250 reacted then I will have two times of that two moles of H I so that means that 368 00:10:00,250 --> 00:10:00,260 that two moles of H I so that means that 369 00:10:00,260 --> 00:10:03,160 that two moles of H I so that means that the change here is equal to the half of 370 00:10:03,160 --> 00:10:03,170 the change here is equal to the half of 371 00:10:03,170 --> 00:10:06,730 the change here is equal to the half of this which is 1 point 8 7 times 10 to 372 00:10:06,730 --> 00:10:06,740 this which is 1 point 8 7 times 10 to 373 00:10:06,740 --> 00:10:09,850 this which is 1 point 8 7 times 10 to the minus 3 molar and this one is also 1 374 00:10:09,850 --> 00:10:09,860 the minus 3 molar and this one is also 1 375 00:10:09,860 --> 00:10:13,000 the minus 3 molar and this one is also 1 point 8 7 times 10 to the minus 3 molar 376 00:10:13,000 --> 00:10:13,010 point 8 7 times 10 to the minus 3 molar 377 00:10:13,010 --> 00:10:23,920 point 8 7 times 10 to the minus 3 molar clear yes don't you yeah / - actually 378 00:10:23,920 --> 00:10:23,930 clear yes don't you yeah / - actually 379 00:10:23,930 --> 00:10:28,740 clear yes don't you yeah / - actually this is the change okay now the initial 380 00:10:28,740 --> 00:10:28,750 this is the change okay now the initial 381 00:10:28,750 --> 00:10:31,300 this is the change okay now the initial equilibrium concentrations this one is 382 00:10:31,300 --> 00:10:31,310 equilibrium concentrations this one is 383 00:10:31,310 --> 00:10:33,639 equilibrium concentrations this one is given so what will be the equilibrium 384 00:10:33,639 --> 00:10:33,649 given so what will be the equilibrium 385 00:10:33,649 --> 00:10:36,819 given so what will be the equilibrium concentration this number minus this 386 00:10:36,819 --> 00:10:36,829 concentration this number minus this 387 00:10:36,829 --> 00:10:40,360 concentration this number minus this change right and that is again 388 00:10:40,360 --> 00:10:40,370 change right and that is again 389 00:10:40,370 --> 00:10:44,920 change right and that is again calculated here as given 9 point 35 390 00:10:44,920 --> 00:10:44,930 calculated here as given 9 point 35 391 00:10:44,930 --> 00:10:47,650 calculated here as given 9 point 35 times 10 to the minus 4 this is going to 392 00:10:47,650 --> 00:10:47,660 times 10 to the minus 4 this is going to 393 00:10:47,660 --> 00:10:56,050 times 10 to the minus 4 this is going to be 9 no let's put that we this will be 394 00:10:56,050 --> 00:10:56,060 be 9 no let's put that we this will be 395 00:10:56,060 --> 00:10:59,500 be 9 no let's put that we this will be actually six point five times 10 to the 396 00:10:59,500 --> 00:10:59,510 actually six point five times 10 to the 397 00:10:59,510 --> 00:11:02,889 actually six point five times 10 to the minus 5 molar and this is going to be 398 00:11:02,889 --> 00:11:02,899 minus 5 molar and this is going to be 399 00:11:02,899 --> 00:11:06,299 minus 5 molar and this is going to be one point 400 00:11:06,299 --> 00:11:06,309 401 00:11:06,309 --> 00:11:09,489 note 10 to the minus 5 bollard this will 402 00:11:09,489 --> 00:11:09,499 note 10 to the minus 5 bollard this will 403 00:11:09,499 --> 00:11:13,679 note 10 to the minus 5 bollard this will be 1.0 6 5 10 to the minus 3 molar at 404 00:11:13,679 --> 00:11:13,689 be 1.0 6 5 10 to the minus 3 molar at 405 00:11:13,689 --> 00:11:19,929 be 1.0 6 5 10 to the minus 3 molar at 1.06 5 times 10 to minus 3 molar and 406 00:11:19,929 --> 00:11:19,939 1.06 5 times 10 to minus 3 molar and 407 00:11:19,939 --> 00:11:23,290 1.06 5 times 10 to minus 3 molar and this is the equilibrium concentrations 408 00:11:23,290 --> 00:11:23,300 this is the equilibrium concentrations 409 00:11:23,300 --> 00:11:26,019 this is the equilibrium concentrations actually is given let me see okay what 410 00:11:26,019 --> 00:11:26,029 actually is given let me see okay what 411 00:11:26,029 --> 00:11:31,109 actually is given let me see okay what is alright this is initial 412 00:11:31,109 --> 00:11:31,119 is alright this is initial 413 00:11:31,119 --> 00:11:34,269 is alright this is initial concentrations and this is the change 414 00:11:34,269 --> 00:11:34,279 concentrations and this is the change 415 00:11:34,279 --> 00:11:38,280 concentrations and this is the change and if you just subtract it by 2 and 416 00:11:38,280 --> 00:11:38,290 and if you just subtract it by 2 and 417 00:11:38,290 --> 00:11:41,290 and if you just subtract it by 2 and yeah subtract that number from this I 418 00:11:41,290 --> 00:11:41,300 yeah subtract that number from this I 419 00:11:41,300 --> 00:11:45,519 yeah subtract that number from this I will have no the subtract that by 2 will 420 00:11:45,519 --> 00:11:45,529 will have no the subtract that by 2 will 421 00:11:45,529 --> 00:11:47,769 will have no the subtract that by 2 will be 9.30 5 10 to the minus 4 422 00:11:47,769 --> 00:11:47,779 be 9.30 5 10 to the minus 4 423 00:11:47,779 --> 00:11:51,910 be 9.30 5 10 to the minus 4 mrs. 9.10 2 minus 4 these here six point 424 00:11:51,910 --> 00:11:51,920 mrs. 9.10 2 minus 4 these here six point 425 00:11:51,920 --> 00:11:53,919 mrs. 9.10 2 minus 4 these here six point five times ten to minus five is obtained 426 00:11:53,919 --> 00:11:53,929 five times ten to minus five is obtained 427 00:11:53,929 --> 00:11:59,710 five times ten to minus five is obtained by subtracting this from this right so 428 00:11:59,710 --> 00:11:59,720 by subtracting this from this right so 429 00:11:59,720 --> 00:12:03,069 by subtracting this from this right so again the initial concentrations the 430 00:12:03,069 --> 00:12:03,079 again the initial concentrations the 431 00:12:03,079 --> 00:12:04,840 again the initial concentrations the equilibrium concentrations of hydrogen 432 00:12:04,840 --> 00:12:04,850 equilibrium concentrations of hydrogen 433 00:12:04,850 --> 00:12:07,600 equilibrium concentrations of hydrogen will be found by taking the initial 434 00:12:07,600 --> 00:12:07,610 will be found by taking the initial 435 00:12:07,610 --> 00:12:10,269 will be found by taking the initial concentration and subtracted this change 436 00:12:10,269 --> 00:12:10,279 concentration and subtracted this change 437 00:12:10,279 --> 00:12:13,179 concentration and subtracted this change actually that's equal to this and this 438 00:12:13,179 --> 00:12:13,189 actually that's equal to this and this 439 00:12:13,189 --> 00:12:15,999 actually that's equal to this and this one taking this number and subtract it 440 00:12:15,999 --> 00:12:16,009 one taking this number and subtract it 441 00:12:16,009 --> 00:12:17,530 one taking this number and subtract it from the initial concentration this is 442 00:12:17,530 --> 00:12:17,540 from the initial concentration this is 443 00:12:17,540 --> 00:12:19,239 from the initial concentration this is the occlusion concentrations and once 444 00:12:19,239 --> 00:12:19,249 the occlusion concentrations and once 445 00:12:19,249 --> 00:12:21,129 the occlusion concentrations and once those are given we can calculate the 446 00:12:21,129 --> 00:12:21,139 those are given we can calculate the 447 00:12:21,139 --> 00:12:22,809 those are given we can calculate the equilibrium constant because the only 448 00:12:22,809 --> 00:12:22,819 equilibrium constant because the only 449 00:12:22,819 --> 00:12:26,249 equilibrium constant because the only thing we have to do is just put them in 450 00:12:26,249 --> 00:12:26,259 thing we have to do is just put them in 451 00:12:26,259 --> 00:12:29,410 thing we have to do is just put them in equations here this is the equilibrium 452 00:12:29,410 --> 00:12:29,420 equations here this is the equilibrium 453 00:12:29,420 --> 00:12:33,189 equations here this is the equilibrium expression K sub C and the concentration 454 00:12:33,189 --> 00:12:33,199 expression K sub C and the concentration 455 00:12:33,199 --> 00:12:34,749 expression K sub C and the concentration square of the concentration is H I 456 00:12:34,749 --> 00:12:34,759 square of the concentration is H I 457 00:12:34,759 --> 00:12:37,600 square of the concentration is H I divided by the concentrations of h2 and 458 00:12:37,600 --> 00:12:37,610 divided by the concentrations of h2 and 459 00:12:37,610 --> 00:12:40,559 divided by the concentrations of h2 and i2 and put the concentrations 460 00:12:40,559 --> 00:12:40,569 i2 and put the concentrations 461 00:12:40,569 --> 00:12:43,869 i2 and put the concentrations equilibrium concentrations of these from 462 00:12:43,869 --> 00:12:43,879 equilibrium concentrations of these from 463 00:12:43,879 --> 00:12:46,090 equilibrium concentrations of these from the previous table then we find out that 464 00:12:46,090 --> 00:12:46,100 the previous table then we find out that 465 00:12:46,100 --> 00:12:49,660 the previous table then we find out that the equivalence is equal to the 51 this 466 00:12:49,660 --> 00:12:49,670 the equivalence is equal to the 51 this 467 00:12:49,670 --> 00:12:52,679 the equivalence is equal to the 51 this is the game very very simple very simple 468 00:12:52,679 --> 00:12:52,689 is the game very very simple very simple 469 00:12:52,689 --> 00:12:56,519 is the game very very simple very simple but you just have to do write the 470 00:12:56,519 --> 00:12:56,529 but you just have to do write the 471 00:12:56,529 --> 00:12:59,259 but you just have to do write the balanced equation and find out the 472 00:12:59,259 --> 00:12:59,269 balanced equation and find out the 473 00:12:59,269 --> 00:13:01,989 balanced equation and find out the initial concentration changes in 474 00:13:01,989 --> 00:13:01,999 initial concentration changes in 475 00:13:01,999 --> 00:13:03,460 initial concentration changes in concentration to reach the equilibrium 476 00:13:03,460 --> 00:13:03,470 concentration to reach the equilibrium 477 00:13:03,470 --> 00:13:06,609 concentration to reach the equilibrium and the equilibrium concentrations once 478 00:13:06,609 --> 00:13:06,619 and the equilibrium concentrations once 479 00:13:06,619 --> 00:13:08,230 and the equilibrium concentrations once you have the equilibrium concentrations 480 00:13:08,230 --> 00:13:08,240 you have the equilibrium concentrations 481 00:13:08,240 --> 00:13:09,789 you have the equilibrium concentrations then you can calculate the equilibrium 482 00:13:09,789 --> 00:13:09,799 then you can calculate the equilibrium 483 00:13:09,799 --> 00:13:14,409 then you can calculate the equilibrium constant now this is another important 484 00:13:14,409 --> 00:13:14,419 constant now this is another important 485 00:13:14,419 --> 00:13:18,400 constant now this is another important concept is that is it says is a mixture 486 00:13:18,400 --> 00:13:18,410 concept is that is it says is a mixture 487 00:13:18,410 --> 00:13:23,379 concept is that is it says is a mixture equilibrium which way does the reaction 488 00:13:23,379 --> 00:13:23,389 equilibrium which way does the reaction 489 00:13:23,389 --> 00:13:29,619 equilibrium which way does the reaction go this is simply means is this the 490 00:13:29,619 --> 00:13:29,629 go this is simply means is this the 491 00:13:29,629 --> 00:13:34,379 go this is simply means is this the equilibrium constant for this K sub C 492 00:13:34,379 --> 00:13:34,389 493 00:13:34,389 --> 00:13:39,610 equals 51 right act what was the 494 00:13:39,610 --> 00:13:39,620 equals 51 right act what was the 495 00:13:39,620 --> 00:13:47,439 equals 51 right act what was the temperature 400 something 448 degree 496 00:13:47,439 --> 00:13:47,449 temperature 400 something 448 degree 497 00:13:47,449 --> 00:13:52,900 temperature 400 something 448 degree centigrade at 448 degrees centigrade now 498 00:13:52,900 --> 00:13:52,910 centigrade at 448 degrees centigrade now 499 00:13:52,910 --> 00:14:02,790 centigrade at 448 degrees centigrade now the question is is this if I simply have 500 00:14:02,790 --> 00:14:02,800 the question is is this if I simply have 501 00:14:02,800 --> 00:14:07,720 the question is is this if I simply have concentrations of h2 equals to one point 502 00:14:07,720 --> 00:14:07,730 concentrations of h2 equals to one point 503 00:14:07,730 --> 00:14:12,720 concentrations of h2 equals to one point zero times 10 to the minus 4 molar and 504 00:14:12,720 --> 00:14:12,730 zero times 10 to the minus 4 molar and 505 00:14:12,730 --> 00:14:18,999 zero times 10 to the minus 4 molar and concentrations of i2 equals to 3 point 5 506 00:14:18,999 --> 00:14:19,009 concentrations of i2 equals to 3 point 5 507 00:14:19,009 --> 00:14:22,509 concentrations of i2 equals to 3 point 5 times 10 to the minus 6 molar and the 508 00:14:22,509 --> 00:14:22,519 times 10 to the minus 6 molar and the 509 00:14:22,519 --> 00:14:29,019 times 10 to the minus 6 molar and the concentrations of H I let's say equals 510 00:14:29,019 --> 00:14:29,029 concentrations of H I let's say equals 511 00:14:29,029 --> 00:14:34,090 concentrations of H I let's say equals to the two point zero times 10 to the 512 00:14:34,090 --> 00:14:34,100 to the two point zero times 10 to the 513 00:14:34,100 --> 00:14:40,300 to the two point zero times 10 to the minus 4 molar like this so I mix them 514 00:14:40,300 --> 00:14:40,310 minus 4 molar like this so I mix them 515 00:14:40,310 --> 00:14:46,019 minus 4 molar like this so I mix them all these are initial concentrations 516 00:14:46,019 --> 00:14:46,029 517 00:14:46,029 --> 00:14:50,920 initial concentrations initial 518 00:14:50,920 --> 00:14:50,930 initial concentrations initial 519 00:14:50,930 --> 00:14:57,460 initial concentrations initial concentrations the hydrogen is 1 0 times 520 00:14:57,460 --> 00:14:57,470 concentrations the hydrogen is 1 0 times 521 00:14:57,470 --> 00:15:02,170 concentrations the hydrogen is 1 0 times 10 to the minus 4 molar I 2 is 3 5 times 522 00:15:02,170 --> 00:15:02,180 10 to the minus 4 molar I 2 is 3 5 times 523 00:15:02,180 --> 00:15:06,129 10 to the minus 4 molar I 2 is 3 5 times 10 to minus 6 molar H I is 2 point 0 524 00:15:06,129 --> 00:15:06,139 10 to minus 6 molar H I is 2 point 0 525 00:15:06,139 --> 00:15:11,429 10 to minus 6 molar H I is 2 point 0 times 10 to the minus 4 molar and all at 526 00:15:11,429 --> 00:15:11,439 times 10 to the minus 4 molar and all at 527 00:15:11,439 --> 00:15:16,439 times 10 to the minus 4 molar and all at 448 that means degrees centigrade now 528 00:15:16,439 --> 00:15:16,449 448 that means degrees centigrade now 529 00:15:16,449 --> 00:15:21,090 448 that means degrees centigrade now the question is there are three 530 00:15:21,090 --> 00:15:21,100 the question is there are three 531 00:15:21,100 --> 00:15:24,119 the question is there are three possibilities actually the first is is 532 00:15:24,119 --> 00:15:24,129 possibilities actually the first is is 533 00:15:24,129 --> 00:15:30,970 possibilities actually the first is is this system is at equilibrium is this 534 00:15:30,970 --> 00:15:30,980 this system is at equilibrium is this 535 00:15:30,980 --> 00:15:33,840 this system is at equilibrium is this system at 536 00:15:33,840 --> 00:15:33,850 537 00:15:33,850 --> 00:15:37,930 now the second question is is if this 538 00:15:37,930 --> 00:15:37,940 now the second question is is if this 539 00:15:37,940 --> 00:15:41,530 now the second question is is if this system is not at equilibrium which way 540 00:15:41,530 --> 00:15:41,540 system is not at equilibrium which way 541 00:15:41,540 --> 00:15:44,260 system is not at equilibrium which way the net reaction will take place to 542 00:15:44,260 --> 00:15:44,270 the net reaction will take place to 543 00:15:44,270 --> 00:15:48,190 the net reaction will take place to reach to the equilibrium to the right or 544 00:15:48,190 --> 00:15:48,200 reach to the equilibrium to the right or 545 00:15:48,200 --> 00:15:49,530 reach to the equilibrium to the right or to the left 546 00:15:49,530 --> 00:15:49,540 to the left 547 00:15:49,540 --> 00:15:53,710 to the left remember again if you simply have a 548 00:15:53,710 --> 00:15:53,720 remember again if you simply have a 549 00:15:53,720 --> 00:15:55,600 remember again if you simply have a mixture of the reactants and the 550 00:15:55,600 --> 00:15:55,610 mixture of the reactants and the 551 00:15:55,610 --> 00:15:59,110 mixture of the reactants and the products for a chemical reaction if the 552 00:15:59,110 --> 00:15:59,120 products for a chemical reaction if the 553 00:15:59,120 --> 00:16:01,300 products for a chemical reaction if the system is at equilibrium there will be 554 00:16:01,300 --> 00:16:01,310 system is at equilibrium there will be 555 00:16:01,310 --> 00:16:05,880 system is at equilibrium there will be no net change to the product side or 556 00:16:05,880 --> 00:16:05,890 no net change to the product side or 557 00:16:05,890 --> 00:16:08,800 no net change to the product side or reactant side that means no net reaction 558 00:16:08,800 --> 00:16:08,810 reactant side that means no net reaction 559 00:16:08,810 --> 00:16:11,710 reactant side that means no net reaction will take place but if the reaction is 560 00:16:11,710 --> 00:16:11,720 will take place but if the reaction is 561 00:16:11,720 --> 00:16:13,510 will take place but if the reaction is not at equilibrium that means those 562 00:16:13,510 --> 00:16:13,520 not at equilibrium that means those 563 00:16:13,520 --> 00:16:14,680 not at equilibrium that means those concentrations are not at equilibrium 564 00:16:14,680 --> 00:16:14,690 concentrations are not at equilibrium 565 00:16:14,690 --> 00:16:17,560 concentrations are not at equilibrium then the system will reach to the 566 00:16:17,560 --> 00:16:17,570 then the system will reach to the 567 00:16:17,570 --> 00:16:19,630 then the system will reach to the equilibrium always if the system is not 568 00:16:19,630 --> 00:16:19,640 equilibrium always if the system is not 569 00:16:19,640 --> 00:16:21,280 equilibrium always if the system is not an equal agreement will reach to the 570 00:16:21,280 --> 00:16:21,290 an equal agreement will reach to the 571 00:16:21,290 --> 00:16:23,200 an equal agreement will reach to the equilibrium but to reach the equilibrium 572 00:16:23,200 --> 00:16:23,210 equilibrium but to reach the equilibrium 573 00:16:23,210 --> 00:16:25,630 equilibrium but to reach the equilibrium it may go from reactant to the product 574 00:16:25,630 --> 00:16:25,640 it may go from reactant to the product 575 00:16:25,640 --> 00:16:28,780 it may go from reactant to the product or it may go from the products to the 576 00:16:28,780 --> 00:16:28,790 or it may go from the products to the 577 00:16:28,790 --> 00:16:33,690 or it may go from the products to the reactants side now can we find out 578 00:16:33,690 --> 00:16:33,700 reactants side now can we find out 579 00:16:33,700 --> 00:16:35,560 reactants side now can we find out whether the system is at equilibrium 580 00:16:35,560 --> 00:16:35,570 whether the system is at equilibrium 581 00:16:35,570 --> 00:16:39,910 whether the system is at equilibrium first second is whether the reaction 582 00:16:39,910 --> 00:16:39,920 first second is whether the reaction 583 00:16:39,920 --> 00:16:42,760 first second is whether the reaction will go net reaction will proceed to the 584 00:16:42,760 --> 00:16:42,770 will go net reaction will proceed to the 585 00:16:42,770 --> 00:16:44,500 will go net reaction will proceed to the right to reach the equilibrium all to 586 00:16:44,500 --> 00:16:44,510 right to reach the equilibrium all to 587 00:16:44,510 --> 00:16:47,200 right to reach the equilibrium all to the left to reach at equilibrium now for 588 00:16:47,200 --> 00:16:47,210 the left to reach at equilibrium now for 589 00:16:47,210 --> 00:16:49,300 the left to reach at equilibrium now for a case like this what we do again is 590 00:16:49,300 --> 00:16:49,310 a case like this what we do again is 591 00:16:49,310 --> 00:16:53,920 a case like this what we do again is this we let's look at this slide here 592 00:16:53,920 --> 00:16:53,930 this we let's look at this slide here 593 00:16:53,930 --> 00:16:59,340 this we let's look at this slide here says we calculate the reaction quotient 594 00:16:59,340 --> 00:16:59,350 says we calculate the reaction quotient 595 00:16:59,350 --> 00:17:02,320 says we calculate the reaction quotient now what is a reaction quotient reaction 596 00:17:02,320 --> 00:17:02,330 now what is a reaction quotient reaction 597 00:17:02,330 --> 00:17:06,730 now what is a reaction quotient reaction quotient is actually the same expression 598 00:17:06,730 --> 00:17:06,740 quotient is actually the same expression 599 00:17:06,740 --> 00:17:10,470 quotient is actually the same expression as the equilibrium expression but the 600 00:17:10,470 --> 00:17:10,480 as the equilibrium expression but the 601 00:17:10,480 --> 00:17:13,840 as the equilibrium expression but the concentrations of the species does not 602 00:17:13,840 --> 00:17:13,850 concentrations of the species does not 603 00:17:13,850 --> 00:17:16,929 concentrations of the species does not do not have to be necessarily the 604 00:17:16,929 --> 00:17:16,939 do not have to be necessarily the 605 00:17:16,939 --> 00:17:20,740 do not have to be necessarily the equilibrium concentrations right so Chu 606 00:17:20,740 --> 00:17:20,750 equilibrium concentrations right so Chu 607 00:17:20,750 --> 00:17:24,340 equilibrium concentrations right so Chu is equals to again I if I write it for 608 00:17:24,340 --> 00:17:24,350 is equals to again I if I write it for 609 00:17:24,350 --> 00:17:26,460 is equals to again I if I write it for this it would be equal to H I 610 00:17:26,460 --> 00:17:26,470 this it would be equal to H I 611 00:17:26,470 --> 00:17:29,010 this it would be equal to H I concentration raised to the power 2 612 00:17:29,010 --> 00:17:29,020 concentration raised to the power 2 613 00:17:29,020 --> 00:17:33,370 concentration raised to the power 2 divided by h2 concentration and then 614 00:17:33,370 --> 00:17:33,380 divided by h2 concentration and then 615 00:17:33,380 --> 00:17:36,060 divided by h2 concentration and then times the i2 concentration like this 616 00:17:36,060 --> 00:17:36,070 times the i2 concentration like this 617 00:17:36,070 --> 00:17:41,160 times the i2 concentration like this okay but now if these concentrations are 618 00:17:41,160 --> 00:17:41,170 okay but now if these concentrations are 619 00:17:41,170 --> 00:17:45,760 okay but now if these concentrations are the equilibrium concentrations then Q 620 00:17:45,760 --> 00:17:45,770 the equilibrium concentrations then Q 621 00:17:45,770 --> 00:17:49,090 the equilibrium concentrations then Q is equal to equilibrium constant 622 00:17:49,090 --> 00:17:49,100 is equal to equilibrium constant 623 00:17:49,100 --> 00:17:54,160 is equal to equilibrium constant now if again how we find out we just put 624 00:17:54,160 --> 00:17:54,170 now if again how we find out we just put 625 00:17:54,170 --> 00:17:56,950 now if again how we find out we just put it there that means if Q is equal to K 626 00:17:56,950 --> 00:17:56,960 it there that means if Q is equal to K 627 00:17:56,960 --> 00:17:59,020 it there that means if Q is equal to K sub C right 628 00:17:59,020 --> 00:17:59,030 sub C right 629 00:17:59,030 --> 00:18:00,820 sub C right that means if I put the values here and 630 00:18:00,820 --> 00:18:00,830 that means if I put the values here and 631 00:18:00,830 --> 00:18:02,380 that means if I put the values here and find out that it's equal to equilibrium 632 00:18:02,380 --> 00:18:02,390 find out that it's equal to equilibrium 633 00:18:02,390 --> 00:18:04,900 find out that it's equal to equilibrium concentration EQ is equal to equilibrium 634 00:18:04,900 --> 00:18:04,910 concentration EQ is equal to equilibrium 635 00:18:04,910 --> 00:18:07,050 concentration EQ is equal to equilibrium that means the system is at equilibrium 636 00:18:07,050 --> 00:18:07,060 that means the system is at equilibrium 637 00:18:07,060 --> 00:18:15,870 that means the system is at equilibrium right system let's say is at equilibrium 638 00:18:15,870 --> 00:18:15,880 639 00:18:15,880 --> 00:18:24,460 now if Q is greater than K sub C that 640 00:18:24,460 --> 00:18:24,470 now if Q is greater than K sub C that 641 00:18:24,470 --> 00:18:27,880 now if Q is greater than K sub C that means reaction quotient right there is 642 00:18:27,880 --> 00:18:27,890 means reaction quotient right there is 643 00:18:27,890 --> 00:18:32,920 means reaction quotient right there is greater than K then to reach the 644 00:18:32,920 --> 00:18:32,930 greater than K then to reach the 645 00:18:32,930 --> 00:18:37,780 greater than K then to reach the equilibrium that means that the Q should 646 00:18:37,780 --> 00:18:37,790 equilibrium that means that the Q should 647 00:18:37,790 --> 00:18:41,710 equilibrium that means that the Q should be decreased 648 00:18:41,710 --> 00:18:41,720 be decreased 649 00:18:41,720 --> 00:18:46,540 be decreased now how can i decrease Q by increasing 650 00:18:46,540 --> 00:18:46,550 now how can i decrease Q by increasing 651 00:18:46,550 --> 00:18:49,420 now how can i decrease Q by increasing the concentrations of these decreasing 652 00:18:49,420 --> 00:18:49,430 the concentrations of these decreasing 653 00:18:49,430 --> 00:18:51,280 the concentrations of these decreasing the concentrations of that what does 654 00:18:51,280 --> 00:18:51,290 the concentrations of that what does 655 00:18:51,290 --> 00:18:54,550 the concentrations of that what does that means that means the system will 656 00:18:54,550 --> 00:18:54,560 that means that means the system will 657 00:18:54,560 --> 00:18:58,180 that means that means the system will shift to the left right that means 658 00:18:58,180 --> 00:18:58,190 shift to the left right that means 659 00:18:58,190 --> 00:18:59,890 shift to the left right that means decreasing the concentrations of that 660 00:18:59,890 --> 00:18:59,900 decreasing the concentrations of that 661 00:18:59,900 --> 00:19:01,930 decreasing the concentrations of that increasing concentration of that system 662 00:19:01,930 --> 00:19:01,940 increasing concentration of that system 663 00:19:01,940 --> 00:19:03,280 increasing concentration of that system will shift to the left there will be a 664 00:19:03,280 --> 00:19:03,290 will shift to the left there will be a 665 00:19:03,290 --> 00:19:06,010 will shift to the left there will be a net reaction to the left need to reach 666 00:19:06,010 --> 00:19:06,020 net reaction to the left need to reach 667 00:19:06,020 --> 00:19:07,810 net reaction to the left need to reach the equilibrium now the third 668 00:19:07,810 --> 00:19:07,820 the equilibrium now the third 669 00:19:07,820 --> 00:19:12,240 the equilibrium now the third possibility is if Q is less than K sub C 670 00:19:12,240 --> 00:19:12,250 possibility is if Q is less than K sub C 671 00:19:12,250 --> 00:19:15,220 possibility is if Q is less than K sub C then the reaction will proceed in as 672 00:19:15,220 --> 00:19:15,230 then the reaction will proceed in as 673 00:19:15,230 --> 00:19:18,010 then the reaction will proceed in as such a way to make the Q equal to K sub 674 00:19:18,010 --> 00:19:18,020 such a way to make the Q equal to K sub 675 00:19:18,020 --> 00:19:20,830 such a way to make the Q equal to K sub C so that means it will increase the 676 00:19:20,830 --> 00:19:20,840 C so that means it will increase the 677 00:19:20,840 --> 00:19:23,170 C so that means it will increase the case of see how the K sub C will be 678 00:19:23,170 --> 00:19:23,180 case of see how the K sub C will be 679 00:19:23,180 --> 00:19:24,910 case of see how the K sub C will be increased by increasing the 680 00:19:24,910 --> 00:19:24,920 increased by increasing the 681 00:19:24,920 --> 00:19:27,190 increased by increasing the concentrations in nominator decreasing 682 00:19:27,190 --> 00:19:27,200 concentrations in nominator decreasing 683 00:19:27,200 --> 00:19:29,740 concentrations in nominator decreasing the concentrations in denominator what 684 00:19:29,740 --> 00:19:29,750 the concentrations in denominator what 685 00:19:29,750 --> 00:19:31,600 the concentrations in denominator what does that means the reaction net 686 00:19:31,600 --> 00:19:31,610 does that means the reaction net 687 00:19:31,610 --> 00:19:33,820 does that means the reaction net reaction will be from left to the right 688 00:19:33,820 --> 00:19:33,830 reaction will be from left to the right 689 00:19:33,830 --> 00:19:36,880 reaction will be from left to the right to reach to the equilibrium clear very 690 00:19:36,880 --> 00:19:36,890 to reach to the equilibrium clear very 691 00:19:36,890 --> 00:19:40,470 to reach to the equilibrium clear very very simple again very simple so let's 692 00:19:40,470 --> 00:19:40,480 very simple again very simple so let's 693 00:19:40,480 --> 00:19:43,660 very simple again very simple so let's see in this case if I just put the 694 00:19:43,660 --> 00:19:43,670 see in this case if I just put the 695 00:19:43,670 --> 00:19:46,120 see in this case if I just put the values here let's put the values here 696 00:19:46,120 --> 00:19:46,130 values here let's put the values here 697 00:19:46,130 --> 00:19:47,830 values here let's put the values here see let's see if you can calculate that 698 00:19:47,830 --> 00:19:47,840 see let's see if you can calculate that 699 00:19:47,840 --> 00:19:52,540 see let's see if you can calculate that each eye is two point zero times sin 2 700 00:19:52,540 --> 00:19:52,550 each eye is two point zero times sin 2 701 00:19:52,550 --> 00:19:58,350 each eye is two point zero times sin 2 minus 4 and squared right and divided by 702 00:19:58,350 --> 00:19:58,360 minus 4 and squared right and divided by 703 00:19:58,360 --> 00:19:59,450 minus 4 and squared right and divided by 1 704 00:19:59,450 --> 00:19:59,460 1 705 00:19:59,460 --> 00:20:03,399 1 point zero times sent the minus 4 molar 706 00:20:03,399 --> 00:20:03,409 point zero times sent the minus 4 molar 707 00:20:03,409 --> 00:20:08,180 point zero times sent the minus 4 molar hydrogen and this one is times 3.5 times 708 00:20:08,180 --> 00:20:08,190 hydrogen and this one is times 3.5 times 709 00:20:08,190 --> 00:20:14,180 hydrogen and this one is times 3.5 times 10 to the minus 6 here and this would be 710 00:20:14,180 --> 00:20:14,190 10 to the minus 6 here and this would be 711 00:20:14,190 --> 00:20:17,029 10 to the minus 6 here and this would be equals to let's see if I can calculate 712 00:20:17,029 --> 00:20:17,039 equals to let's see if I can calculate 713 00:20:17,039 --> 00:20:21,440 equals to let's see if I can calculate it now this is going to be 4 times 10 to 714 00:20:21,440 --> 00:20:21,450 it now this is going to be 4 times 10 to 715 00:20:21,450 --> 00:20:24,919 it now this is going to be 4 times 10 to the minus 8 right 716 00:20:24,919 --> 00:20:24,929 the minus 8 right 717 00:20:24,929 --> 00:20:31,880 the minus 8 right and this is going to be simply 3.5 times 718 00:20:31,880 --> 00:20:31,890 and this is going to be simply 3.5 times 719 00:20:31,890 --> 00:20:38,269 and this is going to be simply 3.5 times 10 to the minus 10 right so the result 720 00:20:38,269 --> 00:20:38,279 10 to the minus 10 right so the result 721 00:20:38,279 --> 00:20:41,480 10 to the minus 10 right so the result would be let's say if this is let's make 722 00:20:41,480 --> 00:20:41,490 would be let's say if this is let's make 723 00:20:41,490 --> 00:20:47,060 would be let's say if this is let's make that 4 or okay let's that would be again 724 00:20:47,060 --> 00:20:47,070 that 4 or okay let's that would be again 725 00:20:47,070 --> 00:20:54,380 that 4 or okay let's that would be again about 1.0 times 10 to the 2 this is 726 00:20:54,380 --> 00:20:54,390 about 1.0 times 10 to the 2 this is 727 00:20:54,390 --> 00:20:58,779 about 1.0 times 10 to the 2 this is about that means is equal to hundred 728 00:20:58,779 --> 00:20:58,789 about that means is equal to hundred 729 00:20:58,789 --> 00:21:04,130 about that means is equal to hundred right so which way the reaction will 730 00:21:04,130 --> 00:21:04,140 right so which way the reaction will 731 00:21:04,140 --> 00:21:06,049 right so which way the reaction will take place again if I if I start with 732 00:21:06,049 --> 00:21:06,059 take place again if I if I start with 733 00:21:06,059 --> 00:21:09,649 take place again if I if I start with these concentrations the coup is much 734 00:21:09,649 --> 00:21:09,659 these concentrations the coup is much 735 00:21:09,659 --> 00:21:14,149 these concentrations the coup is much greater than K sub C right because the K 736 00:21:14,149 --> 00:21:14,159 greater than K sub C right because the K 737 00:21:14,159 --> 00:21:18,529 greater than K sub C right because the K value here is 51 and the Q I calculated 738 00:21:18,529 --> 00:21:18,539 value here is 51 and the Q I calculated 739 00:21:18,539 --> 00:21:22,490 value here is 51 and the Q I calculated here is hundred greater than K sub C 740 00:21:22,490 --> 00:21:22,500 here is hundred greater than K sub C 741 00:21:22,500 --> 00:21:26,120 here is hundred greater than K sub C when Q is greater than K sub C the Q has 742 00:21:26,120 --> 00:21:26,130 when Q is greater than K sub C the Q has 743 00:21:26,130 --> 00:21:28,940 when Q is greater than K sub C the Q has to be decreased decrease in Q means that 744 00:21:28,940 --> 00:21:28,950 to be decreased decrease in Q means that 745 00:21:28,950 --> 00:21:31,399 to be decreased decrease in Q means that the reaction has to go from right to the 746 00:21:31,399 --> 00:21:31,409 the reaction has to go from right to the 747 00:21:31,409 --> 00:21:31,940 the reaction has to go from right to the left 748 00:21:31,940 --> 00:21:31,950 left 749 00:21:31,950 --> 00:21:34,070 left decreasing the H I concentration 750 00:21:34,070 --> 00:21:34,080 decreasing the H I concentration 751 00:21:34,080 --> 00:21:36,529 decreasing the H I concentration increase in the others this is what how 752 00:21:36,529 --> 00:21:36,539 increase in the others this is what how 753 00:21:36,539 --> 00:21:39,110 increase in the others this is what how we apply it let's see I guess this has 754 00:21:39,110 --> 00:21:39,120 we apply it let's see I guess this has 755 00:21:39,120 --> 00:21:42,529 we apply it let's see I guess this has the same thing so Q looks like the 756 00:21:42,529 --> 00:21:42,539 the same thing so Q looks like the 757 00:21:42,539 --> 00:21:45,230 the same thing so Q looks like the equilibrium constant K but the values 758 00:21:45,230 --> 00:21:45,240 equilibrium constant K but the values 759 00:21:45,240 --> 00:21:47,930 equilibrium constant K but the values used to calculate it are the current 760 00:21:47,930 --> 00:21:47,940 used to calculate it are the current 761 00:21:47,940 --> 00:21:50,720 used to calculate it are the current concentrations not necessarily those for 762 00:21:50,720 --> 00:21:50,730 concentrations not necessarily those for 763 00:21:50,730 --> 00:21:53,210 concentrations not necessarily those for equilibrium as I said if they're at 764 00:21:53,210 --> 00:21:53,220 equilibrium as I said if they're at 765 00:21:53,220 --> 00:21:54,950 equilibrium as I said if they're at equilibrium actually Q will be equal to 766 00:21:54,950 --> 00:21:54,960 equilibrium actually Q will be equal to 767 00:21:54,960 --> 00:21:58,430 equilibrium actually Q will be equal to K sub C the equilibrium constant to 768 00:21:58,430 --> 00:21:58,440 K sub C the equilibrium constant to 769 00:21:58,440 --> 00:22:01,789 K sub C the equilibrium constant to locate Q 1 substitute the initial 770 00:22:01,789 --> 00:22:01,799 locate Q 1 substitute the initial 771 00:22:01,799 --> 00:22:03,289 locate Q 1 substitute the initial concentrations of reactants and the 772 00:22:03,289 --> 00:22:03,299 concentrations of reactants and the 773 00:22:03,299 --> 00:22:05,419 concentrations of reactants and the products into the Kalu expression this 774 00:22:05,419 --> 00:22:05,429 products into the Kalu expression this 775 00:22:05,429 --> 00:22:08,029 products into the Kalu expression this is what we have done that means to find 776 00:22:08,029 --> 00:22:08,039 is what we have done that means to find 777 00:22:08,039 --> 00:22:11,149 is what we have done that means to find out where the Q is right we calculate 778 00:22:11,149 --> 00:22:11,159 out where the Q is right we calculate 779 00:22:11,159 --> 00:22:13,039 out where the Q is right we calculate the value of Q to compare it 780 00:22:13,039 --> 00:22:13,049 the value of Q to compare it 781 00:22:13,049 --> 00:22:18,229 the value of Q to compare it and from that again if two is equal to 782 00:22:18,229 --> 00:22:18,239 and from that again if two is equal to 783 00:22:18,239 --> 00:22:21,529 and from that again if two is equal to the K that means the system is at 784 00:22:21,529 --> 00:22:21,539 the K that means the system is at 785 00:22:21,539 --> 00:22:23,080 the K that means the system is at equilibrium 786 00:22:23,080 --> 00:22:23,090 equilibrium 787 00:22:23,090 --> 00:22:28,430 equilibrium now if Q is less than K nature will make 788 00:22:28,430 --> 00:22:28,440 now if Q is less than K nature will make 789 00:22:28,440 --> 00:22:30,590 now if Q is less than K nature will make the reaction proceed to the product side 790 00:22:30,590 --> 00:22:30,600 the reaction proceed to the product side 791 00:22:30,600 --> 00:22:33,470 the reaction proceed to the product side to make the Q larger and make it equal 792 00:22:33,470 --> 00:22:33,480 to make the Q larger and make it equal 793 00:22:33,480 --> 00:22:36,409 to make the Q larger and make it equal to K and if Q is equal to K the reaction 794 00:22:36,409 --> 00:22:36,419 to K and if Q is equal to K the reaction 795 00:22:36,419 --> 00:22:40,070 to K and if Q is equal to K the reaction is actually at equilibrium this says 796 00:22:40,070 --> 00:22:40,080 is actually at equilibrium this says 797 00:22:40,080 --> 00:22:42,889 is actually at equilibrium this says natural wants that Q is equal to K what 798 00:22:42,889 --> 00:22:42,899 natural wants that Q is equal to K what 799 00:22:42,899 --> 00:22:45,139 natural wants that Q is equal to K what does that means that means if you leave 800 00:22:45,139 --> 00:22:45,149 does that means that means if you leave 801 00:22:45,149 --> 00:22:49,759 does that means that means if you leave the system alone it will always reach to 802 00:22:49,759 --> 00:22:49,769 the system alone it will always reach to 803 00:22:49,769 --> 00:22:52,399 the system alone it will always reach to the equilibrium right that's what nature 804 00:22:52,399 --> 00:22:52,409 the equilibrium right that's what nature 805 00:22:52,409 --> 00:22:55,519 the equilibrium right that's what nature wants Q is equal to K means so as I as 806 00:22:55,519 --> 00:22:55,529 wants Q is equal to K means so as I as 807 00:22:55,529 --> 00:22:57,169 wants Q is equal to K means so as I as we said Q is equal to K means the 808 00:22:57,169 --> 00:22:57,179 we said Q is equal to K means the 809 00:22:57,179 --> 00:22:59,840 we said Q is equal to K means the reaction is at in equilibrium if Q is 810 00:22:59,840 --> 00:22:59,850 reaction is at in equilibrium if Q is 811 00:22:59,850 --> 00:23:03,769 reaction is at in equilibrium if Q is greater than K and then in our case Q is 812 00:23:03,769 --> 00:23:03,779 greater than K and then in our case Q is 813 00:23:03,779 --> 00:23:06,470 greater than K and then in our case Q is greater than K sub C and the reaction 814 00:23:06,470 --> 00:23:06,480 greater than K sub C and the reaction 815 00:23:06,480 --> 00:23:09,499 greater than K sub C and the reaction will proceed in the reverse direction to 816 00:23:09,499 --> 00:23:09,509 will proceed in the reverse direction to 817 00:23:09,509 --> 00:23:12,289 will proceed in the reverse direction to lower the kick to and make it equal to K 818 00:23:12,289 --> 00:23:12,299 lower the kick to and make it equal to K 819 00:23:12,299 --> 00:23:16,909 lower the kick to and make it equal to K sub C okay yeah this clear very simple 820 00:23:16,909 --> 00:23:16,919 sub C okay yeah this clear very simple 821 00:23:16,919 --> 00:23:20,869 sub C okay yeah this clear very simple again very very simple now calculating 822 00:23:20,869 --> 00:23:20,879 again very very simple now calculating 823 00:23:20,879 --> 00:23:22,789 again very very simple now calculating equilibrium concentrations again if you 824 00:23:22,789 --> 00:23:22,799 equilibrium concentrations again if you 825 00:23:22,799 --> 00:23:24,349 equilibrium concentrations again if you know the equilibrium constant and if you 826 00:23:24,349 --> 00:23:24,359 know the equilibrium constant and if you 827 00:23:24,359 --> 00:23:28,119 know the equilibrium constant and if you know the initial concentrations of the 828 00:23:28,119 --> 00:23:28,129 know the initial concentrations of the 829 00:23:28,129 --> 00:23:31,129 know the initial concentrations of the reactants for example or the 830 00:23:31,129 --> 00:23:31,139 reactants for example or the 831 00:23:31,139 --> 00:23:33,049 reactants for example or the concentrations of the product and the 832 00:23:33,049 --> 00:23:33,059 concentrations of the product and the 833 00:23:33,059 --> 00:23:36,289 concentrations of the product and the reactant which is not at equilibrium or 834 00:23:36,289 --> 00:23:36,299 reactant which is not at equilibrium or 835 00:23:36,299 --> 00:23:37,820 reactant which is not at equilibrium or not equilibrium we can calculate the 836 00:23:37,820 --> 00:23:37,830 not equilibrium we can calculate the 837 00:23:37,830 --> 00:23:39,680 not equilibrium we can calculate the concentrations of the species at the 838 00:23:39,680 --> 00:23:39,690 concentrations of the species at the 839 00:23:39,690 --> 00:23:42,859 concentrations of the species at the equilibrium so if you know the 840 00:23:42,859 --> 00:23:42,869 equilibrium so if you know the 841 00:23:42,869 --> 00:23:44,389 equilibrium so if you know the equilibrium constant you can find the 842 00:23:44,389 --> 00:23:44,399 equilibrium constant you can find the 843 00:23:44,399 --> 00:23:45,859 equilibrium constant you can find the equilibrium concentrations from initial 844 00:23:45,859 --> 00:23:45,869 equilibrium concentrations from initial 845 00:23:45,869 --> 00:23:48,169 equilibrium concentrations from initial concentrations and changes it says you 846 00:23:48,169 --> 00:23:48,179 concentrations and changes it says you 847 00:23:48,179 --> 00:23:50,810 concentrations and changes it says you will set up a table similar to those 848 00:23:50,810 --> 00:23:50,820 will set up a table similar to those 849 00:23:50,820 --> 00:23:53,060 will set up a table similar to those ones used to find the equilibrium 850 00:23:53,060 --> 00:23:53,070 ones used to find the equilibrium 851 00:23:53,070 --> 00:23:55,759 ones used to find the equilibrium concentration it's always useful to make 852 00:23:55,759 --> 00:23:55,769 concentration it's always useful to make 853 00:23:55,769 --> 00:23:57,919 concentration it's always useful to make that table set up that table actually 854 00:23:57,919 --> 00:23:57,929 that table set up that table actually 855 00:23:57,929 --> 00:24:01,070 that table set up that table actually but the change in concentration row will 856 00:24:01,070 --> 00:24:01,080 but the change in concentration row will 857 00:24:01,080 --> 00:24:04,759 but the change in concentration row will simple be a factor of X based on the 858 00:24:04,759 --> 00:24:04,769 simple be a factor of X based on the 859 00:24:04,769 --> 00:24:08,419 simple be a factor of X based on the stoichiometry let's see how we apply it 860 00:24:08,419 --> 00:24:08,429 stoichiometry let's see how we apply it 861 00:24:08,429 --> 00:24:10,759 stoichiometry let's see how we apply it here again on the same equilibrium 862 00:24:10,759 --> 00:24:10,769 here again on the same equilibrium 863 00:24:10,769 --> 00:24:16,009 here again on the same equilibrium system an example a one liter flask is 864 00:24:16,009 --> 00:24:16,019 system an example a one liter flask is 865 00:24:16,019 --> 00:24:19,940 system an example a one liter flask is filled with one mole of h2 and two moles 866 00:24:19,940 --> 00:24:19,950 filled with one mole of h2 and two moles 867 00:24:19,950 --> 00:24:24,529 filled with one mole of h2 and two moles of i2 at 448 degree centigrade given 868 00:24:24,529 --> 00:24:24,539 of i2 at 448 degree centigrade given 869 00:24:24,539 --> 00:24:26,960 of i2 at 448 degree centigrade given that K sub Z is equal to 50 points 870 00:24:26,960 --> 00:24:26,970 that K sub Z is equal to 50 points 871 00:24:26,970 --> 00:24:29,690 that K sub Z is equal to 50 points five at four four eight degree 872 00:24:29,690 --> 00:24:29,700 five at four four eight degree 873 00:24:29,700 --> 00:24:32,390 five at four four eight degree centigrade what are the equilibrium 874 00:24:32,390 --> 00:24:32,400 centigrade what are the equilibrium 875 00:24:32,400 --> 00:24:37,210 centigrade what are the equilibrium concentrations of H 2 I 2 and H I 876 00:24:37,210 --> 00:24:37,220 concentrations of H 2 I 2 and H I 877 00:24:37,220 --> 00:24:40,730 concentrations of H 2 I 2 and H I actually again sometimes these type of 878 00:24:40,730 --> 00:24:40,740 actually again sometimes these type of 879 00:24:40,740 --> 00:24:45,320 actually again sometimes these type of problems involves calculations you know 880 00:24:45,320 --> 00:24:45,330 problems involves calculations you know 881 00:24:45,330 --> 00:24:49,580 problems involves calculations you know you know sometimes times taking 882 00:24:49,580 --> 00:24:49,590 you know sometimes times taking 883 00:24:49,590 --> 00:24:53,560 you know sometimes times taking calculations but simple math actually 884 00:24:53,560 --> 00:24:53,570 calculations but simple math actually 885 00:24:53,570 --> 00:24:56,960 calculations but simple math actually not more than that just takes time but 886 00:24:56,960 --> 00:24:56,970 not more than that just takes time but 887 00:24:56,970 --> 00:24:59,210 not more than that just takes time but the best way to do that again is it says 888 00:24:59,210 --> 00:24:59,220 the best way to do that again is it says 889 00:24:59,220 --> 00:25:02,570 the best way to do that again is it says set up this table like this and the 890 00:25:02,570 --> 00:25:02,580 set up this table like this and the 891 00:25:02,580 --> 00:25:06,320 set up this table like this and the initial concentrations and the change in 892 00:25:06,320 --> 00:25:06,330 initial concentrations and the change in 893 00:25:06,330 --> 00:25:08,830 initial concentrations and the change in concentrations and equilibrium and 894 00:25:08,830 --> 00:25:08,840 concentrations and equilibrium and 895 00:25:08,840 --> 00:25:11,649 concentrations and equilibrium and concentrations over here again you see 896 00:25:11,649 --> 00:25:11,659 concentrations over here again you see 897 00:25:11,659 --> 00:25:16,580 concentrations over here again you see since the flask the volume of the flask 898 00:25:16,580 --> 00:25:16,590 since the flask the volume of the flask 899 00:25:16,590 --> 00:25:19,370 since the flask the volume of the flask is one liter and we have two mole of i2 900 00:25:19,370 --> 00:25:19,380 is one liter and we have two mole of i2 901 00:25:19,380 --> 00:25:22,880 is one liter and we have two mole of i2 and one mole of h2 that means what molar 902 00:25:22,880 --> 00:25:22,890 and one mole of h2 that means what molar 903 00:25:22,890 --> 00:25:26,779 and one mole of h2 that means what molar concentrations of h2 is 1 molar right 904 00:25:26,779 --> 00:25:26,789 concentrations of h2 is 1 molar right 905 00:25:26,789 --> 00:25:29,659 concentrations of h2 is 1 molar right and the molar concentrations of i2 is 2 906 00:25:29,659 --> 00:25:29,669 and the molar concentrations of i2 is 2 907 00:25:29,669 --> 00:25:32,000 and the molar concentrations of i2 is 2 molar because you just divide the number 908 00:25:32,000 --> 00:25:32,010 molar because you just divide the number 909 00:25:32,010 --> 00:25:34,760 molar because you just divide the number of moles by the volume in liters it will 910 00:25:34,760 --> 00:25:34,770 of moles by the volume in liters it will 911 00:25:34,770 --> 00:25:36,350 of moles by the volume in liters it will give you the molar concentrations so 912 00:25:36,350 --> 00:25:36,360 give you the molar concentrations so 913 00:25:36,360 --> 00:25:38,240 give you the molar concentrations so these are the molar concentrations here 914 00:25:38,240 --> 00:25:38,250 these are the molar concentrations here 915 00:25:38,250 --> 00:25:42,770 these are the molar concentrations here 1 0 0 and 2 0 0 molar concentrations and 916 00:25:42,770 --> 00:25:42,780 1 0 0 and 2 0 0 molar concentrations and 917 00:25:42,780 --> 00:25:47,480 1 0 0 and 2 0 0 molar concentrations and now the change of this again would be as 918 00:25:47,480 --> 00:25:47,490 now the change of this again would be as 919 00:25:47,490 --> 00:25:53,419 now the change of this again would be as follows if minus X mole molar amount of 920 00:25:53,419 --> 00:25:53,429 follows if minus X mole molar amount of 921 00:25:53,429 --> 00:25:57,919 follows if minus X mole molar amount of h2 is reacted then minus X molar amount 922 00:25:57,919 --> 00:25:57,929 h2 is reacted then minus X molar amount 923 00:25:57,929 --> 00:26:00,740 h2 is reacted then minus X molar amount of a I 2 will react with it what does 924 00:26:00,740 --> 00:26:00,750 of a I 2 will react with it what does 925 00:26:00,750 --> 00:26:02,390 of a I 2 will react with it what does that mean that means the change in the 926 00:26:02,390 --> 00:26:02,400 that mean that means the change in the 927 00:26:02,400 --> 00:26:04,100 that mean that means the change in the molar concentration then in that case in 928 00:26:04,100 --> 00:26:04,110 molar concentration then in that case in 929 00:26:04,110 --> 00:26:07,039 molar concentration then in that case in H 2 will be minus X minus means it will 930 00:26:07,039 --> 00:26:07,049 H 2 will be minus X minus means it will 931 00:26:07,049 --> 00:26:10,039 H 2 will be minus X minus means it will be reduced that much and the molar 932 00:26:10,039 --> 00:26:10,049 be reduced that much and the molar 933 00:26:10,049 --> 00:26:11,960 be reduced that much and the molar concentration change in I 2 will be 934 00:26:11,960 --> 00:26:11,970 concentration change in I 2 will be 935 00:26:11,970 --> 00:26:14,450 concentration change in I 2 will be minus X the same amount now what will be 936 00:26:14,450 --> 00:26:14,460 minus X the same amount now what will be 937 00:26:14,460 --> 00:26:17,210 minus X the same amount now what will be the molar concentrations of H I actually 938 00:26:17,210 --> 00:26:17,220 the molar concentrations of H I actually 939 00:26:17,220 --> 00:26:19,520 the molar concentrations of H I actually change in molar concentrations of H I 940 00:26:19,520 --> 00:26:19,530 change in molar concentrations of H I 941 00:26:19,530 --> 00:26:21,590 change in molar concentrations of H I since this is zero at the beginning as 942 00:26:21,590 --> 00:26:21,600 since this is zero at the beginning as 943 00:26:21,600 --> 00:26:24,860 since this is zero at the beginning as you see here when one mole of that 944 00:26:24,860 --> 00:26:24,870 you see here when one mole of that 945 00:26:24,870 --> 00:26:28,100 you see here when one mole of that reacts two moles of H I produced that 946 00:26:28,100 --> 00:26:28,110 reacts two moles of H I produced that 947 00:26:28,110 --> 00:26:30,470 reacts two moles of H I produced that means that the concentration change in H 948 00:26:30,470 --> 00:26:30,480 means that the concentration change in H 949 00:26:30,480 --> 00:26:34,419 means that the concentration change in H I at the equilibrium will be plus two x 950 00:26:34,419 --> 00:26:34,429 I at the equilibrium will be plus two x 951 00:26:34,429 --> 00:26:37,820 I at the equilibrium will be plus two x two times of that now why it is plus 952 00:26:37,820 --> 00:26:37,830 two times of that now why it is plus 953 00:26:37,830 --> 00:26:40,040 two times of that now why it is plus because plus simply 954 00:26:40,040 --> 00:26:40,050 because plus simply 955 00:26:40,050 --> 00:26:43,550 because plus simply indicates increasing in concentration - 956 00:26:43,550 --> 00:26:43,560 indicates increasing in concentration - 957 00:26:43,560 --> 00:26:45,680 indicates increasing in concentration - indicates the change in decrease in 958 00:26:45,680 --> 00:26:45,690 indicates the change in decrease in 959 00:26:45,690 --> 00:26:48,950 indicates the change in decrease in concentration and at equilibrium again 960 00:26:48,950 --> 00:26:48,960 concentration and at equilibrium again 961 00:26:48,960 --> 00:26:49,760 concentration and at equilibrium again we write down the equilibrium 962 00:26:49,760 --> 00:26:49,770 we write down the equilibrium 963 00:26:49,770 --> 00:26:51,800 we write down the equilibrium concentrations if this is the change 964 00:26:51,800 --> 00:26:51,810 concentrations if this is the change 965 00:26:51,810 --> 00:26:53,390 concentrations if this is the change then the equilibrium concentrations of 966 00:26:53,390 --> 00:26:53,400 then the equilibrium concentrations of 967 00:26:53,400 --> 00:26:55,610 then the equilibrium concentrations of hydrogen will be the initial 968 00:26:55,610 --> 00:26:55,620 hydrogen will be the initial 969 00:26:55,620 --> 00:26:57,500 hydrogen will be the initial concentrations of hydrogen which is 1 970 00:26:57,500 --> 00:26:57,510 concentrations of hydrogen which is 1 971 00:26:57,510 --> 00:27:00,110 concentrations of hydrogen which is 1 molar minus X and this is two molars 972 00:27:00,110 --> 00:27:00,120 molar minus X and this is two molars 973 00:27:00,120 --> 00:27:02,360 molar minus X and this is two molars minus X and this will be 2 X since at 974 00:27:02,360 --> 00:27:02,370 minus X and this will be 2 X since at 975 00:27:02,370 --> 00:27:05,360 minus X and this will be 2 X since at the beginning we didn't have any and now 976 00:27:05,360 --> 00:27:05,370 the beginning we didn't have any and now 977 00:27:05,370 --> 00:27:08,090 the beginning we didn't have any and now we put it in the equation equilibrium 978 00:27:08,090 --> 00:27:08,100 we put it in the equation equilibrium 979 00:27:08,100 --> 00:27:13,160 we put it in the equation equilibrium expression and solve equation for X it 980 00:27:13,160 --> 00:27:13,170 expression and solve equation for X it 981 00:27:13,170 --> 00:27:15,440 expression and solve equation for X it will be a quadratic equation and we have 982 00:27:15,440 --> 00:27:15,450 will be a quadratic equation and we have 983 00:27:15,450 --> 00:27:17,180 will be a quadratic equation and we have to solve the quadratic equation again 984 00:27:17,180 --> 00:27:17,190 to solve the quadratic equation again 985 00:27:17,190 --> 00:27:19,340 to solve the quadratic equation again and this is the equilibrium expression 986 00:27:19,340 --> 00:27:19,350 and this is the equilibrium expression 987 00:27:19,350 --> 00:27:22,660 and this is the equilibrium expression now these are the equilibrium 988 00:27:22,660 --> 00:27:22,670 now these are the equilibrium 989 00:27:22,670 --> 00:27:25,910 now these are the equilibrium concentrations in terms of initial 990 00:27:25,910 --> 00:27:25,920 concentrations in terms of initial 991 00:27:25,920 --> 00:27:29,120 concentrations in terms of initial concentrations and in terms of changes 992 00:27:29,120 --> 00:27:29,130 concentrations and in terms of changes 993 00:27:29,130 --> 00:27:34,100 concentrations and in terms of changes that we simply call that X actually and 994 00:27:34,100 --> 00:27:34,110 that we simply call that X actually and 995 00:27:34,110 --> 00:27:36,320 that we simply call that X actually and the equilibrium concentration of the 996 00:27:36,320 --> 00:27:36,330 the equilibrium concentration of the 997 00:27:36,330 --> 00:27:39,440 the equilibrium concentration of the product 3 X 2 squared - x hydrogen 998 00:27:39,440 --> 00:27:39,450 product 3 X 2 squared - x hydrogen 999 00:27:39,450 --> 00:27:41,330 product 3 X 2 squared - x hydrogen iodide and this is the equilibrium 1000 00:27:41,330 --> 00:27:41,340 iodide and this is the equilibrium 1001 00:27:41,340 --> 00:27:44,060 iodide and this is the equilibrium concentration starting with this - X 1002 00:27:44,060 --> 00:27:44,070 concentration starting with this - X 1003 00:27:44,070 --> 00:27:47,720 concentration starting with this - X this is the minus X again 2 minus X and 1004 00:27:47,720 --> 00:27:47,730 this is the minus X again 2 minus X and 1005 00:27:47,730 --> 00:27:49,790 this is the minus X again 2 minus X and this is equal to this so we take this 1006 00:27:49,790 --> 00:27:49,800 this is equal to this so we take this 1007 00:27:49,800 --> 00:27:54,590 this is equal to this so we take this part and solve it solve it for X and 1008 00:27:54,590 --> 00:27:54,600 part and solve it solve it for X and 1009 00:27:54,600 --> 00:27:56,990 part and solve it solve it for X and this is going to be a quadratic equation 1010 00:27:56,990 --> 00:27:57,000 this is going to be a quadratic equation 1011 00:27:57,000 --> 00:28:01,400 this is going to be a quadratic equation remember the quadratic equations as you 1012 00:28:01,400 --> 00:28:01,410 remember the quadratic equations as you 1013 00:28:01,410 --> 00:28:03,770 remember the quadratic equations as you probably know from the calculus as minus 1014 00:28:03,770 --> 00:28:03,780 probably know from the calculus as minus 1015 00:28:03,780 --> 00:28:07,610 probably know from the calculus as minus b plus/minus square root for AC b square 1016 00:28:07,610 --> 00:28:07,620 b plus/minus square root for AC b square 1017 00:28:07,620 --> 00:28:10,820 b plus/minus square root for AC b square minus 4ac divided by 2a know that 1018 00:28:10,820 --> 00:28:10,830 minus 4ac divided by 2a know that 1019 00:28:10,830 --> 00:28:15,140 minus 4ac divided by 2a know that formula then you calculate the X but you 1020 00:28:15,140 --> 00:28:15,150 formula then you calculate the X but you 1021 00:28:15,150 --> 00:28:17,660 formula then you calculate the X but you have to be careful again here since this 1022 00:28:17,660 --> 00:28:17,670 have to be careful again here since this 1023 00:28:17,670 --> 00:28:19,400 have to be careful again here since this is quadratic you will find out two 1024 00:28:19,400 --> 00:28:19,410 is quadratic you will find out two 1025 00:28:19,410 --> 00:28:23,150 is quadratic you will find out two values for X X is unknown here right now 1026 00:28:23,150 --> 00:28:23,160 values for X X is unknown here right now 1027 00:28:23,160 --> 00:28:29,030 values for X X is unknown here right now usually one of the value doesn't have 1028 00:28:29,030 --> 00:28:29,040 usually one of the value doesn't have 1029 00:28:29,040 --> 00:28:31,520 usually one of the value doesn't have any meaning because if you just put that 1030 00:28:31,520 --> 00:28:31,530 any meaning because if you just put that 1031 00:28:31,530 --> 00:28:34,760 any meaning because if you just put that X for example this value of x in the 1032 00:28:34,760 --> 00:28:34,770 X for example this value of x in the 1033 00:28:34,770 --> 00:28:37,520 X for example this value of x in the equilibrium expression here since this 1034 00:28:37,520 --> 00:28:37,530 equilibrium expression here since this 1035 00:28:37,530 --> 00:28:43,760 equilibrium expression here since this is 1 and subtract 2.3 to 3 from that the 1036 00:28:43,760 --> 00:28:43,770 is 1 and subtract 2.3 to 3 from that the 1037 00:28:43,770 --> 00:28:45,800 is 1 and subtract 2.3 to 3 from that the number will be minus and the same thing 1038 00:28:45,800 --> 00:28:45,810 number will be minus and the same thing 1039 00:28:45,810 --> 00:28:48,380 number will be minus and the same thing will be also true here - - and that's 1040 00:28:48,380 --> 00:28:48,390 will be also true here - - and that's 1041 00:28:48,390 --> 00:28:50,780 will be also true here - - and that's not right you know that the 1042 00:28:50,780 --> 00:28:50,790 not right you know that the 1043 00:28:50,790 --> 00:28:53,300 not right you know that the concentration or change in concentration 1044 00:28:53,300 --> 00:28:53,310 concentration or change in concentration 1045 00:28:53,310 --> 00:28:54,320 concentration or change in concentration and 1046 00:28:54,320 --> 00:28:54,330 and 1047 00:28:54,330 --> 00:28:55,789 and not be greater than the initial 1048 00:28:55,789 --> 00:28:55,799 not be greater than the initial 1049 00:28:55,799 --> 00:29:00,440 not be greater than the initial concentration there's no amount of the 1050 00:29:00,440 --> 00:29:00,450 concentration there's no amount of the 1051 00:29:00,450 --> 00:29:02,990 concentration there's no amount of the reactant that we have there changes so 1052 00:29:02,990 --> 00:29:03,000 reactant that we have there changes so 1053 00:29:03,000 --> 00:29:05,330 reactant that we have there changes so this is you just throw out this and this 1054 00:29:05,330 --> 00:29:05,340 this is you just throw out this and this 1055 00:29:05,340 --> 00:29:09,799 this is you just throw out this and this is your answer to the questions so the 1056 00:29:09,799 --> 00:29:09,809 is your answer to the questions so the 1057 00:29:09,809 --> 00:29:13,389 is your answer to the questions so the concentrations of the species at 1058 00:29:13,389 --> 00:29:13,399 concentrations of the species at 1059 00:29:13,399 --> 00:29:15,830 concentrations of the species at equilibrium we have to calculate that 1060 00:29:15,830 --> 00:29:15,840 equilibrium we have to calculate that 1061 00:29:15,840 --> 00:29:18,769 equilibrium we have to calculate that that is the value of x actually the 1062 00:29:18,769 --> 00:29:18,779 that is the value of x actually the 1063 00:29:18,779 --> 00:29:20,330 that is the value of x actually the concentration will be found by 1064 00:29:20,330 --> 00:29:20,340 concentration will be found by 1065 00:29:20,340 --> 00:29:22,430 concentration will be found by subtracting the initial concentration 1066 00:29:22,430 --> 00:29:22,440 subtracting the initial concentration 1067 00:29:22,440 --> 00:29:24,409 subtracting the initial concentration from the initial concentration 1068 00:29:24,409 --> 00:29:24,419 from the initial concentration 1069 00:29:24,419 --> 00:29:26,720 from the initial concentration subtracting the X the concentration at 1070 00:29:26,720 --> 00:29:26,730 subtracting the X the concentration at 1071 00:29:26,730 --> 00:29:30,169 subtracting the X the concentration at equilibrium for hydrogen is 0.065 molar 1072 00:29:30,169 --> 00:29:30,179 equilibrium for hydrogen is 0.065 molar 1073 00:29:30,179 --> 00:29:32,419 equilibrium for hydrogen is 0.065 molar and the same way the concentrations of 1074 00:29:32,419 --> 00:29:32,429 and the same way the concentrations of 1075 00:29:32,429 --> 00:29:35,330 and the same way the concentrations of i2 is one point six five molar and this 1076 00:29:35,330 --> 00:29:35,340 i2 is one point six five molar and this 1077 00:29:35,340 --> 00:29:38,090 i2 is one point six five molar and this is 1 point eighty 7 molar very simple 1078 00:29:38,090 --> 00:29:38,100 is 1 point eighty 7 molar very simple 1079 00:29:38,100 --> 00:29:40,730 is 1 point eighty 7 molar very simple very very simple once you set up your 1080 00:29:40,730 --> 00:29:40,740 very very simple once you set up your 1081 00:29:40,740 --> 00:29:44,240 very very simple once you set up your problem and see the changes and write 1082 00:29:44,240 --> 00:29:44,250 problem and see the changes and write 1083 00:29:44,250 --> 00:29:46,220 problem and see the changes and write down the equilibrium concentration in 1084 00:29:46,220 --> 00:29:46,230 down the equilibrium concentration in 1085 00:29:46,230 --> 00:29:49,340 down the equilibrium concentration in terms of initial concentration and the 1086 00:29:49,340 --> 00:29:49,350 terms of initial concentration and the 1087 00:29:49,350 --> 00:29:53,419 terms of initial concentration and the change of X then you can solve the 1088 00:29:53,419 --> 00:29:53,429 change of X then you can solve the 1089 00:29:53,429 --> 00:29:57,139 change of X then you can solve the problem all right now 1090 00:29:57,139 --> 00:29:57,149 problem all right now 1091 00:29:57,149 --> 00:29:59,389 problem all right now Lucia tell your principal is also very 1092 00:29:59,389 --> 00:29:59,399 Lucia tell your principal is also very 1093 00:29:59,399 --> 00:30:01,909 Lucia tell your principal is also very very simple if you understand what it 1094 00:30:01,909 --> 00:30:01,919 very simple if you understand what it 1095 00:30:01,919 --> 00:30:06,259 very simple if you understand what it means here it says if a system at 1096 00:30:06,259 --> 00:30:06,269 means here it says if a system at 1097 00:30:06,269 --> 00:30:10,159 means here it says if a system at equilibrium is disturbed by a change in 1098 00:30:10,159 --> 00:30:10,169 equilibrium is disturbed by a change in 1099 00:30:10,169 --> 00:30:14,330 equilibrium is disturbed by a change in temperature pressure or concentration of 1100 00:30:14,330 --> 00:30:14,340 temperature pressure or concentration of 1101 00:30:14,340 --> 00:30:18,139 temperature pressure or concentration of one of the components the system will 1102 00:30:18,139 --> 00:30:18,149 one of the components the system will 1103 00:30:18,149 --> 00:30:21,080 one of the components the system will shift in his equilibrium position so as 1104 00:30:21,080 --> 00:30:21,090 shift in his equilibrium position so as 1105 00:30:21,090 --> 00:30:23,779 shift in his equilibrium position so as to counteract the effect of the 1106 00:30:23,779 --> 00:30:23,789 to counteract the effect of the 1107 00:30:23,789 --> 00:30:28,789 to counteract the effect of the disturbance what does that means first 1108 00:30:28,789 --> 00:30:28,799 disturbance what does that means first 1109 00:30:28,799 --> 00:30:30,740 disturbance what does that means first of all this simply means suppose you 1110 00:30:30,740 --> 00:30:30,750 of all this simply means suppose you 1111 00:30:30,750 --> 00:30:40,399 of all this simply means suppose you have an equilibrium system let's simply 1112 00:30:40,399 --> 00:30:40,409 have an equilibrium system let's simply 1113 00:30:40,409 --> 00:30:47,889 have an equilibrium system let's simply take this reaction again gas plus i2 gas 1114 00:30:47,889 --> 00:30:47,899 take this reaction again gas plus i2 gas 1115 00:30:47,899 --> 00:30:54,110 take this reaction again gas plus i2 gas equilibrium H I gas - this is in a 1116 00:30:54,110 --> 00:30:54,120 equilibrium H I gas - this is in a 1117 00:30:54,120 --> 00:31:00,470 equilibrium H I gas - this is in a closed system at equilibrium now if you 1118 00:31:00,470 --> 00:31:00,480 closed system at equilibrium now if you 1119 00:31:00,480 --> 00:31:06,140 closed system at equilibrium now if you disturb the equilibrium 1120 00:31:06,140 --> 00:31:06,150 1121 00:31:06,150 --> 00:31:10,540 and let the system alone again the 1122 00:31:10,540 --> 00:31:10,550 and let the system alone again the 1123 00:31:10,550 --> 00:31:12,890 and let the system alone again the system will reach to the equilibrium 1124 00:31:12,890 --> 00:31:12,900 system will reach to the equilibrium 1125 00:31:12,900 --> 00:31:16,250 system will reach to the equilibrium again but it will not be the issue we 1126 00:31:16,250 --> 00:31:16,260 again but it will not be the issue we 1127 00:31:16,260 --> 00:31:18,260 again but it will not be the issue we could probably the values of the you 1128 00:31:18,260 --> 00:31:18,270 could probably the values of the you 1129 00:31:18,270 --> 00:31:19,960 could probably the values of the you know concentration values may not be the 1130 00:31:19,960 --> 00:31:19,970 know concentration values may not be the 1131 00:31:19,970 --> 00:31:22,880 know concentration values may not be the initial concentrations of or initial 1132 00:31:22,880 --> 00:31:22,890 initial concentrations of or initial 1133 00:31:22,890 --> 00:31:24,620 initial concentrations of or initial equilibrium concentrations I should I 1134 00:31:24,620 --> 00:31:24,630 equilibrium concentrations I should I 1135 00:31:24,630 --> 00:31:29,210 equilibrium concentrations I should I should say and how can you disturb the 1136 00:31:29,210 --> 00:31:29,220 should say and how can you disturb the 1137 00:31:29,220 --> 00:31:33,350 should say and how can you disturb the equilibrium system as it says here you 1138 00:31:33,350 --> 00:31:33,360 equilibrium system as it says here you 1139 00:31:33,360 --> 00:31:38,570 equilibrium system as it says here you can change the temperature this is let's 1140 00:31:38,570 --> 00:31:38,580 can change the temperature this is let's 1141 00:31:38,580 --> 00:31:45,190 can change the temperature this is let's say at 448 degrees centigrade right so 1142 00:31:45,190 --> 00:31:45,200 say at 448 degrees centigrade right so 1143 00:31:45,200 --> 00:31:48,200 say at 448 degrees centigrade right so if you change the temperature of the 1144 00:31:48,200 --> 00:31:48,210 if you change the temperature of the 1145 00:31:48,210 --> 00:31:55,940 if you change the temperature of the system let's say 490 degrees centigrade 1146 00:31:55,940 --> 00:31:55,950 system let's say 490 degrees centigrade 1147 00:31:55,950 --> 00:31:57,890 system let's say 490 degrees centigrade that means it will be disturbance that 1148 00:31:57,890 --> 00:31:57,900 that means it will be disturbance that 1149 00:31:57,900 --> 00:31:59,120 that means it will be disturbance that means that that temperature the system 1150 00:31:59,120 --> 00:31:59,130 means that that temperature the system 1151 00:31:59,130 --> 00:32:02,540 means that that temperature the system will not be anymore at equilibrium but 1152 00:32:02,540 --> 00:32:02,550 will not be anymore at equilibrium but 1153 00:32:02,550 --> 00:32:05,030 will not be anymore at equilibrium but what will happen if you let it alone it 1154 00:32:05,030 --> 00:32:05,040 what will happen if you let it alone it 1155 00:32:05,040 --> 00:32:08,300 what will happen if you let it alone it will reach to the equilibrium okay now 1156 00:32:08,300 --> 00:32:08,310 will reach to the equilibrium okay now 1157 00:32:08,310 --> 00:32:11,390 will reach to the equilibrium okay now another way of doing it type change in 1158 00:32:11,390 --> 00:32:11,400 another way of doing it type change in 1159 00:32:11,400 --> 00:32:13,880 another way of doing it type change in the pressure these are all gases and 1160 00:32:13,880 --> 00:32:13,890 the pressure these are all gases and 1161 00:32:13,890 --> 00:32:16,310 the pressure these are all gases and there is any actually this is in a 1162 00:32:16,310 --> 00:32:16,320 there is any actually this is in a 1163 00:32:16,320 --> 00:32:18,410 there is any actually this is in a closed system so there's going to be a 1164 00:32:18,410 --> 00:32:18,420 closed system so there's going to be a 1165 00:32:18,420 --> 00:32:21,710 closed system so there's going to be a total pressure of the system due to the 1166 00:32:21,710 --> 00:32:21,720 total pressure of the system due to the 1167 00:32:21,720 --> 00:32:24,680 total pressure of the system due to the partial pressures of hydrogen and iodine 1168 00:32:24,680 --> 00:32:24,690 partial pressures of hydrogen and iodine 1169 00:32:24,690 --> 00:32:27,290 partial pressures of hydrogen and iodine and hydrogen iodide there will be 1170 00:32:27,290 --> 00:32:27,300 and hydrogen iodide there will be 1171 00:32:27,300 --> 00:32:28,730 and hydrogen iodide there will be partial pressures of that but there will 1172 00:32:28,730 --> 00:32:28,740 partial pressures of that but there will 1173 00:32:28,740 --> 00:32:30,950 partial pressures of that but there will be a total pressure actually now how can 1174 00:32:30,950 --> 00:32:30,960 be a total pressure actually now how can 1175 00:32:30,960 --> 00:32:34,550 be a total pressure actually now how can you change the pressure of this closed 1176 00:32:34,550 --> 00:32:34,560 you change the pressure of this closed 1177 00:32:34,560 --> 00:32:47,540 you change the pressure of this closed system 1178 00:32:47,540 --> 00:32:47,550 1179 00:32:47,550 --> 00:32:51,420 if you add yeah if you add Noble get a 1180 00:32:51,420 --> 00:32:51,430 if you add yeah if you add Noble get a 1181 00:32:51,430 --> 00:32:54,870 if you add yeah if you add Noble get a noble gas neon for example nothing will 1182 00:32:54,870 --> 00:32:54,880 noble gas neon for example nothing will 1183 00:32:54,880 --> 00:32:55,410 noble gas neon for example nothing will happen 1184 00:32:55,410 --> 00:32:55,420 happen 1185 00:32:55,420 --> 00:32:59,960 happen doesn't matter how much you simply add 1186 00:32:59,960 --> 00:32:59,970 1187 00:32:59,970 --> 00:33:04,740 because when we say the change in 1188 00:33:04,740 --> 00:33:04,750 because when we say the change in 1189 00:33:04,750 --> 00:33:07,620 because when we say the change in pressure means the change in pressure of 1190 00:33:07,620 --> 00:33:07,630 pressure means the change in pressure of 1191 00:33:07,630 --> 00:33:11,640 pressure means the change in pressure of the system due to these gases or change 1192 00:33:11,640 --> 00:33:11,650 the system due to these gases or change 1193 00:33:11,650 --> 00:33:13,580 the system due to these gases or change in the partial pressures of one of those 1194 00:33:13,580 --> 00:33:13,590 in the partial pressures of one of those 1195 00:33:13,590 --> 00:33:16,500 in the partial pressures of one of those actually alright so how can we change 1196 00:33:16,500 --> 00:33:16,510 actually alright so how can we change 1197 00:33:16,510 --> 00:33:21,240 actually alright so how can we change the pressure yes that's all it is by 1198 00:33:21,240 --> 00:33:21,250 the pressure yes that's all it is by 1199 00:33:21,250 --> 00:33:24,750 the pressure yes that's all it is by change in volume if you increase the 1200 00:33:24,750 --> 00:33:24,760 change in volume if you increase the 1201 00:33:24,760 --> 00:33:28,080 change in volume if you increase the volume total pressure due to these it 1202 00:33:28,080 --> 00:33:28,090 volume total pressure due to these it 1203 00:33:28,090 --> 00:33:30,420 volume total pressure due to these it will decrease but if you decrease the 1204 00:33:30,420 --> 00:33:30,430 will decrease but if you decrease the 1205 00:33:30,430 --> 00:33:32,460 will decrease but if you decrease the volume then the total pressure will 1206 00:33:32,460 --> 00:33:32,470 volume then the total pressure will 1207 00:33:32,470 --> 00:33:35,340 volume then the total pressure will increase now the third is the 1208 00:33:35,340 --> 00:33:35,350 increase now the third is the 1209 00:33:35,350 --> 00:33:37,920 increase now the third is the concentration changes that means I can 1210 00:33:37,920 --> 00:33:37,930 concentration changes that means I can 1211 00:33:37,930 --> 00:33:39,630 concentration changes that means I can simply change the concentrations of 1212 00:33:39,630 --> 00:33:39,640 simply change the concentrations of 1213 00:33:39,640 --> 00:33:41,070 simply change the concentrations of these how can I do that 1214 00:33:41,070 --> 00:33:41,080 these how can I do that 1215 00:33:41,080 --> 00:33:45,360 these how can I do that simply remove some from the system or 1216 00:33:45,360 --> 00:33:45,370 simply remove some from the system or 1217 00:33:45,370 --> 00:33:48,890 simply remove some from the system or add more to the system at equilibrium 1218 00:33:48,890 --> 00:33:48,900 add more to the system at equilibrium 1219 00:33:48,900 --> 00:33:51,810 add more to the system at equilibrium again these are all disturbance that 1220 00:33:51,810 --> 00:33:51,820 again these are all disturbance that 1221 00:33:51,820 --> 00:33:54,360 again these are all disturbance that means if you have done one of these that 1222 00:33:54,360 --> 00:33:54,370 means if you have done one of these that 1223 00:33:54,370 --> 00:33:56,310 means if you have done one of these that the system is not anymore at equilibrium 1224 00:33:56,310 --> 00:33:56,320 the system is not anymore at equilibrium 1225 00:33:56,320 --> 00:33:57,990 the system is not anymore at equilibrium and it will reach the equilibrium this 1226 00:33:57,990 --> 00:33:58,000 and it will reach the equilibrium this 1227 00:33:58,000 --> 00:34:00,300 and it will reach the equilibrium this is what it says now how it will reach to 1228 00:34:00,300 --> 00:34:00,310 is what it says now how it will reach to 1229 00:34:00,310 --> 00:34:03,450 is what it says now how it will reach to the equilibrium I guess this is probably 1230 00:34:03,450 --> 00:34:03,460 the equilibrium I guess this is probably 1231 00:34:03,460 --> 00:34:05,850 the equilibrium I guess this is probably difficult to read it but let's let's 1232 00:34:05,850 --> 00:34:05,860 difficult to read it but let's let's 1233 00:34:05,860 --> 00:34:09,810 difficult to read it but let's let's start with the concentration but let me 1234 00:34:09,810 --> 00:34:09,820 start with the concentration but let me 1235 00:34:09,820 --> 00:34:12,030 start with the concentration but let me see it I guess I have to go back because 1236 00:34:12,030 --> 00:34:12,040 see it I guess I have to go back because 1237 00:34:12,040 --> 00:34:16,820 see it I guess I have to go back because the most important thing is here it says 1238 00:34:16,820 --> 00:34:16,830 the most important thing is here it says 1239 00:34:16,830 --> 00:34:20,399 the most important thing is here it says now the system he this this part is 1240 00:34:20,399 --> 00:34:20,409 now the system he this this part is 1241 00:34:20,409 --> 00:34:23,010 now the system he this this part is reported the system will shift it is 1242 00:34:23,010 --> 00:34:23,020 reported the system will shift it is 1243 00:34:23,020 --> 00:34:26,550 reported the system will shift it is equilibrium position so as to counteract 1244 00:34:26,550 --> 00:34:26,560 equilibrium position so as to counteract 1245 00:34:26,560 --> 00:34:30,840 equilibrium position so as to counteract the effect of the disturbance this means 1246 00:34:30,840 --> 00:34:30,850 the effect of the disturbance this means 1247 00:34:30,850 --> 00:34:34,139 the effect of the disturbance this means whatever you have done to disturb the 1248 00:34:34,139 --> 00:34:34,149 whatever you have done to disturb the 1249 00:34:34,149 --> 00:34:37,860 whatever you have done to disturb the system the system will try to counteract 1250 00:34:37,860 --> 00:34:37,870 system the system will try to counteract 1251 00:34:37,870 --> 00:34:40,950 system the system will try to counteract that what does that means in terms of 1252 00:34:40,950 --> 00:34:40,960 that what does that means in terms of 1253 00:34:40,960 --> 00:34:42,450 that what does that means in terms of concentration is let's take the first 1254 00:34:42,450 --> 00:34:42,460 concentration is let's take the first 1255 00:34:42,460 --> 00:34:46,169 concentration is let's take the first concentration suppose that I add some 1256 00:34:46,169 --> 00:34:46,179 concentration suppose that I add some 1257 00:34:46,179 --> 00:34:49,740 concentration suppose that I add some hydrogen gas to this system at 1258 00:34:49,740 --> 00:34:49,750 hydrogen gas to this system at 1259 00:34:49,750 --> 00:34:52,830 hydrogen gas to this system at equilibrium from the outside what does 1260 00:34:52,830 --> 00:34:52,840 equilibrium from the outside what does 1261 00:34:52,840 --> 00:34:55,290 equilibrium from the outside what does that means I increase the concentrations 1262 00:34:55,290 --> 00:34:55,300 that means I increase the concentrations 1263 00:34:55,300 --> 00:34:56,220 that means I increase the concentrations of the hydrogen 1264 00:34:56,220 --> 00:34:56,230 of the hydrogen 1265 00:34:56,230 --> 00:34:58,859 of the hydrogen so the system will try to counter act 1266 00:34:58,859 --> 00:34:58,869 so the system will try to counter act 1267 00:34:58,869 --> 00:35:01,319 so the system will try to counter act that effect that means it will try to 1268 00:35:01,319 --> 00:35:01,329 that effect that means it will try to 1269 00:35:01,329 --> 00:35:05,550 that effect that means it will try to decrease that concentration how can it 1270 00:35:05,550 --> 00:35:05,560 decrease that concentration how can it 1271 00:35:05,560 --> 00:35:07,680 decrease that concentration how can it do that by shifting the equilibrium 1272 00:35:07,680 --> 00:35:07,690 do that by shifting the equilibrium 1273 00:35:07,690 --> 00:35:10,040 do that by shifting the equilibrium because it will shift to this direction 1274 00:35:10,040 --> 00:35:10,050 because it will shift to this direction 1275 00:35:10,050 --> 00:35:13,800 because it will shift to this direction right until what until the equilibrium 1276 00:35:13,800 --> 00:35:13,810 right until what until the equilibrium 1277 00:35:13,810 --> 00:35:18,020 right until what until the equilibrium is really all right now suppose that 1278 00:35:18,020 --> 00:35:18,030 is really all right now suppose that 1279 00:35:18,030 --> 00:35:22,950 is really all right now suppose that again at equilibrium I remove Aitu from 1280 00:35:22,950 --> 00:35:22,960 again at equilibrium I remove Aitu from 1281 00:35:22,960 --> 00:35:27,390 again at equilibrium I remove Aitu from the system that will be equivalent or 1282 00:35:27,390 --> 00:35:27,400 the system that will be equivalent or 1283 00:35:27,400 --> 00:35:29,790 the system that will be equivalent or saying reducing the concentrations of I 1284 00:35:29,790 --> 00:35:29,800 saying reducing the concentrations of I 1285 00:35:29,800 --> 00:35:32,880 saying reducing the concentrations of I to iodine right now 1286 00:35:32,880 --> 00:35:32,890 to iodine right now 1287 00:35:32,890 --> 00:35:35,099 to iodine right now the system will try to increase the 1288 00:35:35,099 --> 00:35:35,109 the system will try to increase the 1289 00:35:35,109 --> 00:35:37,490 the system will try to increase the concentrations of that now how the 1290 00:35:37,490 --> 00:35:37,500 concentrations of that now how the 1291 00:35:37,500 --> 00:35:41,040 concentrations of that now how the concentrations of i2 can be increased in 1292 00:35:41,040 --> 00:35:41,050 concentrations of i2 can be increased in 1293 00:35:41,050 --> 00:35:44,310 concentrations of i2 can be increased in this system if the equilibrium shifts to 1294 00:35:44,310 --> 00:35:44,320 this system if the equilibrium shifts to 1295 00:35:44,320 --> 00:35:48,210 this system if the equilibrium shifts to the left right and that will increase 1296 00:35:48,210 --> 00:35:48,220 the left right and that will increase 1297 00:35:48,220 --> 00:35:51,960 the left right and that will increase until what until the equilibrium is 1298 00:35:51,960 --> 00:35:51,970 until what until the equilibrium is 1299 00:35:51,970 --> 00:35:53,730 until what until the equilibrium is established new equilibrium is 1300 00:35:53,730 --> 00:35:53,740 established new equilibrium is 1301 00:35:53,740 --> 00:35:56,880 established new equilibrium is established right again now this is the 1302 00:35:56,880 --> 00:35:56,890 established right again now this is the 1303 00:35:56,890 --> 00:35:59,300 established right again now this is the concentration change now how about we 1304 00:35:59,300 --> 00:35:59,310 concentration change now how about we 1305 00:35:59,310 --> 00:36:04,079 concentration change now how about we simply if I add H I to the system it 1306 00:36:04,079 --> 00:36:04,089 simply if I add H I to the system it 1307 00:36:04,089 --> 00:36:07,140 simply if I add H I to the system it will shift this way if I remove H I it 1308 00:36:07,140 --> 00:36:07,150 will shift this way if I remove H I it 1309 00:36:07,150 --> 00:36:10,050 will shift this way if I remove H I it will shift that way again increase in 1310 00:36:10,050 --> 00:36:10,060 will shift that way again increase in 1311 00:36:10,060 --> 00:36:11,520 will shift that way again increase in the concentration the system will try to 1312 00:36:11,520 --> 00:36:11,530 the concentration the system will try to 1313 00:36:11,530 --> 00:36:13,530 the concentration the system will try to decrease it if you decrease the 1314 00:36:13,530 --> 00:36:13,540 decrease it if you decrease the 1315 00:36:13,540 --> 00:36:15,059 decrease it if you decrease the concentration the system will try to 1316 00:36:15,059 --> 00:36:15,069 concentration the system will try to 1317 00:36:15,069 --> 00:36:18,089 concentration the system will try to increase now pressure wise let's look at 1318 00:36:18,089 --> 00:36:18,099 increase now pressure wise let's look at 1319 00:36:18,099 --> 00:36:22,250 increase now pressure wise let's look at the pressure if I simply decreed 1320 00:36:22,250 --> 00:36:22,260 the pressure if I simply decreed 1321 00:36:22,260 --> 00:36:24,780 the pressure if I simply decreed decrease the volume of this system that 1322 00:36:24,780 --> 00:36:24,790 decrease the volume of this system that 1323 00:36:24,790 --> 00:36:26,910 decrease the volume of this system that means that the total pressure will 1324 00:36:26,910 --> 00:36:26,920 means that the total pressure will 1325 00:36:26,920 --> 00:36:30,630 means that the total pressure will increase so the system will try to do 1326 00:36:30,630 --> 00:36:30,640 increase so the system will try to do 1327 00:36:30,640 --> 00:36:33,450 increase so the system will try to do what to reach the equilibrium it will 1328 00:36:33,450 --> 00:36:33,460 what to reach the equilibrium it will 1329 00:36:33,460 --> 00:36:38,069 what to reach the equilibrium it will try to decrease the total constant total 1330 00:36:38,069 --> 00:36:38,079 try to decrease the total constant total 1331 00:36:38,079 --> 00:36:41,430 try to decrease the total constant total pressure how can it decrease the total 1332 00:36:41,430 --> 00:36:41,440 pressure how can it decrease the total 1333 00:36:41,440 --> 00:36:45,990 pressure how can it decrease the total pressure in this case shift in which way 1334 00:36:45,990 --> 00:36:46,000 pressure in this case shift in which way 1335 00:36:46,000 --> 00:36:48,990 pressure in this case shift in which way the total pressure will decrease to the 1336 00:36:48,990 --> 00:36:49,000 the total pressure will decrease to the 1337 00:36:49,000 --> 00:36:52,380 the total pressure will decrease to the left or to the right it will not change 1338 00:36:52,380 --> 00:36:52,390 left or to the right it will not change 1339 00:36:52,390 --> 00:36:55,620 left or to the right it will not change yes exactly it will not in this case it 1340 00:36:55,620 --> 00:36:55,630 yes exactly it will not in this case it 1341 00:36:55,630 --> 00:36:58,349 yes exactly it will not in this case it will not change but if I have let's say 1342 00:36:58,349 --> 00:36:58,359 will not change but if I have let's say 1343 00:36:58,359 --> 00:37:09,900 will not change but if I have let's say this system h2 gas + + o2 gas to h2o 1344 00:37:09,900 --> 00:37:09,910 this system h2 gas + + o2 gas to h2o 1345 00:37:09,910 --> 00:37:16,160 this system h2 gas + + o2 gas to h2o yes I guess all right in this case I 1346 00:37:16,160 --> 00:37:16,170 1347 00:37:16,170 --> 00:37:18,960 guess this is correct right get that 1348 00:37:18,960 --> 00:37:18,970 guess this is correct right get that 1349 00:37:18,970 --> 00:37:21,000 guess this is correct right get that correct in this case if I have a system 1350 00:37:21,000 --> 00:37:21,010 correct in this case if I have a system 1351 00:37:21,010 --> 00:37:23,790 correct in this case if I have a system like that decrease in the volume and 1352 00:37:23,790 --> 00:37:23,800 like that decrease in the volume and 1353 00:37:23,800 --> 00:37:28,500 like that decrease in the volume and increase in the pressure then which way 1354 00:37:28,500 --> 00:37:28,510 increase in the pressure then which way 1355 00:37:28,510 --> 00:37:30,860 increase in the pressure then which way it will go this way or that go that way 1356 00:37:30,860 --> 00:37:30,870 it will go this way or that go that way 1357 00:37:30,870 --> 00:37:34,320 it will go this way or that go that way to the right right it will go why 1358 00:37:34,320 --> 00:37:34,330 to the right right it will go why 1359 00:37:34,330 --> 00:37:38,070 to the right right it will go why because by shifting the reaction to the 1360 00:37:38,070 --> 00:37:38,080 because by shifting the reaction to the 1361 00:37:38,080 --> 00:37:41,130 because by shifting the reaction to the right in this case will decrease the 1362 00:37:41,130 --> 00:37:41,140 right in this case will decrease the 1363 00:37:41,140 --> 00:37:44,870 right in this case will decrease the number of gas molecules in that valley 1364 00:37:44,870 --> 00:37:44,880 number of gas molecules in that valley 1365 00:37:44,880 --> 00:37:47,400 number of gas molecules in that valley right decreasing the number of gas 1366 00:37:47,400 --> 00:37:47,410 right decreasing the number of gas 1367 00:37:47,410 --> 00:37:49,740 right decreasing the number of gas molecules or number of moles of gas 1368 00:37:49,740 --> 00:37:49,750 molecules or number of moles of gas 1369 00:37:49,750 --> 00:37:52,170 molecules or number of moles of gas molecules means the pressure will 1370 00:37:52,170 --> 00:37:52,180 molecules means the pressure will 1371 00:37:52,180 --> 00:37:54,920 molecules means the pressure will decrease the pressure will decrease and 1372 00:37:54,920 --> 00:37:54,930 decrease the pressure will decrease and 1373 00:37:54,930 --> 00:37:57,690 decrease the pressure will decrease and that's that's again the case if I 1374 00:37:57,690 --> 00:37:57,700 that's that's again the case if I 1375 00:37:57,700 --> 00:38:02,040 that's that's again the case if I increase this value then the reaction 1376 00:38:02,040 --> 00:38:02,050 increase this value then the reaction 1377 00:38:02,050 --> 00:38:03,510 increase this value then the reaction will shift the pressure will be 1378 00:38:03,510 --> 00:38:03,520 will shift the pressure will be 1379 00:38:03,520 --> 00:38:05,730 will shift the pressure will be decreased and the reaction will shift 1380 00:38:05,730 --> 00:38:05,740 decreased and the reaction will shift 1381 00:38:05,740 --> 00:38:08,910 decreased and the reaction will shift backwards because two moles of gas will 1382 00:38:08,910 --> 00:38:08,920 backwards because two moles of gas will 1383 00:38:08,920 --> 00:38:11,040 backwards because two moles of gas will produce actually three moles that means 1384 00:38:11,040 --> 00:38:11,050 produce actually three moles that means 1385 00:38:11,050 --> 00:38:13,440 produce actually three moles that means it will shift that way but if the number 1386 00:38:13,440 --> 00:38:13,450 it will shift that way but if the number 1387 00:38:13,450 --> 00:38:15,660 it will shift that way but if the number of gas molecules as in this case on the 1388 00:38:15,660 --> 00:38:15,670 of gas molecules as in this case on the 1389 00:38:15,670 --> 00:38:18,210 of gas molecules as in this case on the left and on the right are the same the 1390 00:38:18,210 --> 00:38:18,220 left and on the right are the same the 1391 00:38:18,220 --> 00:38:20,820 left and on the right are the same the change of pressure or the change of 1392 00:38:20,820 --> 00:38:20,830 change of pressure or the change of 1393 00:38:20,830 --> 00:38:23,250 change of pressure or the change of volume will not affect the equilibrium 1394 00:38:23,250 --> 00:38:23,260 volume will not affect the equilibrium 1395 00:38:23,260 --> 00:38:25,440 volume will not affect the equilibrium system in this case there will be no 1396 00:38:25,440 --> 00:38:25,450 system in this case there will be no 1397 00:38:25,450 --> 00:38:29,520 system in this case there will be no effect on the equilibrium system now how 1398 00:38:29,520 --> 00:38:29,530 effect on the equilibrium system now how 1399 00:38:29,530 --> 00:38:36,260 effect on the equilibrium system now how about the what is left here temperature 1400 00:38:36,260 --> 00:38:36,270 about the what is left here temperature 1401 00:38:36,270 --> 00:38:41,190 about the what is left here temperature right now remember when temperature 1402 00:38:41,190 --> 00:38:41,200 right now remember when temperature 1403 00:38:41,200 --> 00:38:44,180 right now remember when temperature changes the equilibrium constant changes 1404 00:38:44,180 --> 00:38:44,190 changes the equilibrium constant changes 1405 00:38:44,190 --> 00:38:47,390 changes the equilibrium constant changes right equilibrium constant changes so by 1406 00:38:47,390 --> 00:38:47,400 right equilibrium constant changes so by 1407 00:38:47,400 --> 00:38:56,630 right equilibrium constant changes so by changing the temperature how the system 1408 00:38:56,630 --> 00:38:56,640 changing the temperature how the system 1409 00:38:56,640 --> 00:39:00,150 changing the temperature how the system will counteract that depends on whether 1410 00:39:00,150 --> 00:39:00,160 will counteract that depends on whether 1411 00:39:00,160 --> 00:39:03,650 will counteract that depends on whether your reaction is exothermic reaction or 1412 00:39:03,650 --> 00:39:03,660 your reaction is exothermic reaction or 1413 00:39:03,660 --> 00:39:07,950 your reaction is exothermic reaction or endothermic reaction right now this one 1414 00:39:07,950 --> 00:39:07,960 endothermic reaction right now this one 1415 00:39:07,960 --> 00:39:12,500 endothermic reaction right now this one here exothermic reaction exothermic 1416 00:39:12,500 --> 00:39:12,510 here exothermic reaction exothermic 1417 00:39:12,510 --> 00:39:18,300 here exothermic reaction exothermic reaction what does that means that means 1418 00:39:18,300 --> 00:39:18,310 reaction what does that means that means 1419 00:39:18,310 --> 00:39:20,940 reaction what does that means that means Delta H is less than zero 1420 00:39:20,940 --> 00:39:20,950 Delta H is less than zero 1421 00:39:20,950 --> 00:39:23,610 Delta H is less than zero that's what exothermic means right so 1422 00:39:23,610 --> 00:39:23,620 that's what exothermic means right so 1423 00:39:23,620 --> 00:39:28,170 that's what exothermic means right so here if I simply increase the 1424 00:39:28,170 --> 00:39:28,180 here if I simply increase the 1425 00:39:28,180 --> 00:39:33,420 here if I simply increase the temperature what does that means I'm 1426 00:39:33,420 --> 00:39:33,430 temperature what does that means I'm 1427 00:39:33,430 --> 00:39:36,000 temperature what does that means I'm increasing the total energy of the 1428 00:39:36,000 --> 00:39:36,010 increasing the total energy of the 1429 00:39:36,010 --> 00:39:39,630 increasing the total energy of the system so it will try again this is in 1430 00:39:39,630 --> 00:39:39,640 system so it will try again this is in 1431 00:39:39,640 --> 00:39:41,160 system so it will try again this is in terms of kinetic energy you can think 1432 00:39:41,160 --> 00:39:41,170 terms of kinetic energy you can think 1433 00:39:41,170 --> 00:39:43,380 terms of kinetic energy you can think about that in terms of kinetic energy so 1434 00:39:43,380 --> 00:39:43,390 about that in terms of kinetic energy so 1435 00:39:43,390 --> 00:39:46,110 about that in terms of kinetic energy so the system will try to decrease it how 1436 00:39:46,110 --> 00:39:46,120 the system will try to decrease it how 1437 00:39:46,120 --> 00:39:50,820 the system will try to decrease it how the total kinetic energy and energy 1438 00:39:50,820 --> 00:39:50,830 the total kinetic energy and energy 1439 00:39:50,830 --> 00:39:52,770 the total kinetic energy and energy actually will be decreased by simply 1440 00:39:52,770 --> 00:39:52,780 actually will be decreased by simply 1441 00:39:52,780 --> 00:39:56,490 actually will be decreased by simply shift in this way because the reaction 1442 00:39:56,490 --> 00:39:56,500 shift in this way because the reaction 1443 00:39:56,500 --> 00:39:59,700 shift in this way because the reaction going that way means that the heat will 1444 00:39:59,700 --> 00:39:59,710 going that way means that the heat will 1445 00:39:59,710 --> 00:40:02,340 going that way means that the heat will be absorbed from the surroundings right 1446 00:40:02,340 --> 00:40:02,350 be absorbed from the surroundings right 1447 00:40:02,350 --> 00:40:07,290 be absorbed from the surroundings right surrounded so again the change of the 1448 00:40:07,290 --> 00:40:07,300 surrounded so again the change of the 1449 00:40:07,300 --> 00:40:08,870 surrounded so again the change of the equilibrium constant with temperature 1450 00:40:08,870 --> 00:40:08,880 equilibrium constant with temperature 1451 00:40:08,880 --> 00:40:11,100 equilibrium constant with temperature depends whether you're exothermic 1452 00:40:11,100 --> 00:40:11,110 depends whether you're exothermic 1453 00:40:11,110 --> 00:40:13,200 depends whether you're exothermic reaction or endothermic reaction in this 1454 00:40:13,200 --> 00:40:13,210 reaction or endothermic reaction in this 1455 00:40:13,210 --> 00:40:16,260 reaction or endothermic reaction in this case as T increases for exothermic 1456 00:40:16,260 --> 00:40:16,270 case as T increases for exothermic 1457 00:40:16,270 --> 00:40:20,430 case as T increases for exothermic reaction KC decreases you can put it 1458 00:40:20,430 --> 00:40:20,440 reaction KC decreases you can put it 1459 00:40:20,440 --> 00:40:24,540 reaction KC decreases you can put it that way for exothermic reaction but for 1460 00:40:24,540 --> 00:40:24,550 that way for exothermic reaction but for 1461 00:40:24,550 --> 00:40:28,830 that way for exothermic reaction but for endothermic reaction and the thermic 1462 00:40:28,830 --> 00:40:28,840 endothermic reaction and the thermic 1463 00:40:28,840 --> 00:40:35,280 endothermic reaction and the thermic reaction where Delta H is greater than 1464 00:40:35,280 --> 00:40:35,290 reaction where Delta H is greater than 1465 00:40:35,290 --> 00:40:37,940 reaction where Delta H is greater than zero now increase in the temperature 1466 00:40:37,940 --> 00:40:37,950 zero now increase in the temperature 1467 00:40:37,950 --> 00:40:41,580 zero now increase in the temperature will also increase the equilibrium 1468 00:40:41,580 --> 00:40:41,590 will also increase the equilibrium 1469 00:40:41,590 --> 00:40:46,050 will also increase the equilibrium constant right so what does that means 1470 00:40:46,050 --> 00:40:46,060 constant right so what does that means 1471 00:40:46,060 --> 00:40:50,370 constant right so what does that means that means for exothermic reaction at 1472 00:40:50,370 --> 00:40:50,380 that means for exothermic reaction at 1473 00:40:50,380 --> 00:40:55,440 that means for exothermic reaction at equilibrium right if you simply increase 1474 00:40:55,440 --> 00:40:55,450 equilibrium right if you simply increase 1475 00:40:55,450 --> 00:40:57,630 equilibrium right if you simply increase the temperature the reaction will shift 1476 00:40:57,630 --> 00:40:57,640 the temperature the reaction will shift 1477 00:40:57,640 --> 00:41:00,980 the temperature the reaction will shift from the product to the reactant side 1478 00:41:00,980 --> 00:41:00,990 from the product to the reactant side 1479 00:41:00,990 --> 00:41:03,990 from the product to the reactant side for the anatomic reaction increase in 1480 00:41:03,990 --> 00:41:04,000 for the anatomic reaction increase in 1481 00:41:04,000 --> 00:41:05,910 for the anatomic reaction increase in the temperature simply the product will 1482 00:41:05,910 --> 00:41:05,920 the temperature simply the product will 1483 00:41:05,920 --> 00:41:09,150 the temperature simply the product will shift just the other way around the KC 1484 00:41:09,150 --> 00:41:09,160 shift just the other way around the KC 1485 00:41:09,160 --> 00:41:11,190 shift just the other way around the KC will increase from reactant to the 1486 00:41:11,190 --> 00:41:11,200 will increase from reactant to the 1487 00:41:11,200 --> 00:41:14,490 will increase from reactant to the product again this is what the look 1488 00:41:14,490 --> 00:41:14,500 product again this is what the look 1489 00:41:14,500 --> 00:41:17,280 product again this is what the look should show your principal are all about 1490 00:41:17,280 --> 00:41:17,290 should show your principal are all about 1491 00:41:17,290 --> 00:41:21,060 should show your principal are all about that is the effect of temperature effect 1492 00:41:21,060 --> 00:41:21,070 that is the effect of temperature effect 1493 00:41:21,070 --> 00:41:23,930 that is the effect of temperature effect of pressure by change in volume or 1494 00:41:23,930 --> 00:41:23,940 of pressure by change in volume or 1495 00:41:23,940 --> 00:41:26,940 of pressure by change in volume or effect of concentration by change in the 1496 00:41:26,940 --> 00:41:26,950 effect of concentration by change in the 1497 00:41:26,950 --> 00:41:29,910 effect of concentration by change in the concentrations of the reactant or the 1498 00:41:29,910 --> 00:41:29,920 concentrations of the reactant or the 1499 00:41:29,920 --> 00:41:33,150 concentrations of the reactant or the product in equipment okay I guess let's 1500 00:41:33,150 --> 00:41:33,160 product in equipment okay I guess let's 1501 00:41:33,160 --> 00:41:36,150 product in equipment okay I guess let's see if I have more all right 1502 00:41:36,150 --> 00:41:36,160 see if I have more all right 1503 00:41:36,160 --> 00:41:41,430 see if I have more all right I guess we will leave it here let's have 1504 00:41:41,430 --> 00:41:41,440 I guess we will leave it here let's have 1505 00:41:41,440 --> 00:41:44,579 I guess we will leave it here let's have a break ten minutes