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![[Post New]](/templates/default/images/icon_minipost_new.gif) 12 Dec 2007 22:42:44 IST
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This is from p block chapter!! why is Ka2 of H2SO4 less than Ka1in water??
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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12 Dec 2007 23:29:39 IST
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Not clear with the question.Plz clear it.
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The heights by the great men reached and kept were not attained by a sudden flight ,but they while their companions slept were toiling upwards in the night. |
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12 Dec 2007 23:35:34 IST
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quite simple..... u know abt conjugate acid and bases, right?? u also know that all try to reach stability .., right?/ same here.... H2SO4 is a quite strong acid, so after losing one H+ , it becomes HSO4- and it has more tendency to get one H+ rather than losing it... on the other hand , water is aphoteric substance weak in both, OH- is a very strong base, so water has a tendency to form it. hence, its ka1 is more. i hope it is clear??
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Woods are lovely dark and deep
But i have promises to keep
And miles to go before i sleep
And miles to go before i sleep
" HAVE A NICE DAY "
     
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12 Dec 2007 23:36:24 IST
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H2SO4 CAN IONISE IN 2 STEPS. so during the ionisation, why is Ka2 of H2SO4 less than Ka1? ka- dissociation constant
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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12 Dec 2007 23:38:47 IST
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thanx!! i got it!!
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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12 Dec 2007 23:39:19 IST
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i know ka is dissociation constant of acids........ is my answer not clear?? tell me where doubt is?? i will try to explain it in a diff way
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Woods are lovely dark and deep
But i have promises to keep
And miles to go before i sleep
And miles to go before i sleep
" HAVE A NICE DAY "
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14 Dec 2007 14:04:26 IST
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Ka1 of H2SO4 is higher and its a very strong acid. So theres already a very high conc. of H+ ions. So now the further dissociation of the HSO4- is depressed due to common-ion effect. So the second dissociation is very small, and reaches equilibrium very fast. Hence Ka2 is very small, implying HSO4- is a very weak acid.
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A diamond is merely a lump of coal that did well under pressure. So imagine how brilliant a human being can be by sustaining pressures of life. Be hopeful.. and fight till end.
Prashant. |
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