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16 April, 07:51

How much more acetic acid (pka = 4.76) than acetate should be in solution to maintain a ph of 4.00?

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  1. 16 April, 10:43
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    By using Henderson-Hasselblach equation:

    we can get [A-]/[HA]

    when PH = Pka + ㏒[A-]/[HA]

    PH = Pka + ㏒ [acetate] / [acetic acid]

    So by substitution: PH = 4 & Pka = 4.76

    4 = 4.76 + ㏒[acetate] / [acetic acid]

    ∴[acetate] / [acetic acid] = 0.174

    ∴[acetic acid] / [acetate] = 1 / 0.174 = 5.747
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