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Topic: calculating Ksp  (Read 7957 times)

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Offline kimi85

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calculating Ksp
« on: July 16, 2007, 08:21:55 PM »
A saturated solution of silver benzoate AgOCOC6H5, has a pH of 8.63. Ka for benzoic acid is 6.5 x 10-5.  Estimate the value of Ksp for silver benzoate.  The correct answer is 1.44 x 10-2 but I can't get to that..

Offline kimi85

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Re: calculating Ksp
« Reply #1 on: July 16, 2007, 09:01:33 PM »
I got it. My answer is just close enough. It's 1.40 x 10-2.
This is what I did: I calculate the molar concentration of OH- from the given pH. Then I input it in the ICE table which is

C6H5COO- + H2O -->        C6H5COOH +       OH-
x - 4.26 x 10-6 +4.26 x 10-6    + 4.26 x 10-6

Then, I calculate x. x squared is the Ksp.

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