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Topic: How to calculate pH of Polyprotic acids  (Read 5684 times)

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Offline sbuzz

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How to calculate pH of Polyprotic acids
« on: October 23, 2006, 02:01:43 AM »
Hi all, I'm all new here.
This is a standard pH calculation problem.

SO2 dissolves in water to give an acidic solution.
Ka for H2SO3 --  1.6*10-2
Ka for HSO3-  --  6.3*10-8

Find pH of 0.10 moldm-3 solution of aqueous SO2.


It will be great if the answer is a bit detailed.
I also appreciate all help I can get.
thx
« Last Edit: October 23, 2006, 02:30:14 AM by sbuzz »
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Offline Borek

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Re: How to calculate pH of Polybasic acids
« Reply #1 on: October 23, 2006, 02:26:55 AM »
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Offline AWK

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Re: How to calculate pH of Polyprotic acids
« Reply #2 on: October 23, 2006, 03:40:42 AM »
It is sufficient to use only the first step of dissociation for calculation of pH with exception of H2SO4 and wersenic acid.
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Offline Borek

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Re: How to calculate pH of Polyprotic acids
« Reply #3 on: October 23, 2006, 04:29:18 AM »
Quote from: AWK on October 23, 2006, 03:40:42 AM
It is sufficient to use only the first step of dissociation for calculation of pH with exception of H2SO4 and wersenic acid.

And in the case of some diluted acids - citric, oxalic (10-4M).
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