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Topic: calculating pH  (Read 3812 times)

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Offline simpleton

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calculating pH
« on: August 16, 2009, 05:04:34 AM »
Dear all, I've this question:
What is the pH of a solution containing 0.2M acetic acid (pka = 4.7) and 0.1M sodium acetate?

My working is as following:

pH = pKa + log (A-/HA+)
pH = 4.7 + log (0.1M/0.2M)
pH = -1.41

Is my answer correct? So for A- and HA+ they are actually the concentration of the particular compounds?

Thanks in advance :D
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Offline Borek

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Re: calculating pH
« Reply #1 on: August 16, 2009, 05:20:47 AM »
Answer is wrong. You are in general on the right track, but the result is completely off.
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Offline simpleton

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Re: calculating pH
« Reply #2 on: August 19, 2009, 05:28:53 AM »
Hi Borek, I realised it's calculation mistake. Opps. :) thanks for your comment. :)
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