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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19-03-2018
Chemistry

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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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superman1987 superman1987 · Answer 1 · 2018-03-28T22:39:07+02:00

superman1987 superman1987

28-03-2018

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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