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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?

Deborah Edwards

in Chemistry

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Rodney Fox on September 19, 2018

Through the use of 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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