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15 December, 20:22

What is the ph of the benzoic acid solution prior to adding sodium benzoate?

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  1. 15 December, 21:37
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    The acid dissociation constant of benzoic acid is 6.5 x 10^-5. Therefore, the pH of the benzoic acid solution prior to adding sodium benzoate is:

    pH = - log[Ka]

    pH = - log (6.5 x 10^-5)

    pH = 4.19

    The pH of the benzoic acid solution is 4.19 which is acidic, but a weak acid.
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