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Question

What ratio of acetic acid to sodium acetate concentration is needed to achieve a buffer whose pH is 5.70? The dissociation constant of acetic acid is 1.8×105.

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Solution

pH=pKa+log[Salt][Acid]
5.7=5log(1.8)+log[Salt][Acid]
5.7=50.255+log[Salt][Acid]
0.955=log[Salt][Acid]
[Salt][Acid]=9

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