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30-03-2018
Chemistry

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You wish to prepare an hc2h3o2 buffer with a ph of 4.34. if the pka of is 4.74, what ratio of c2h3o2/hc2h3o2 must you use?

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superman1987 superman1987

08-04-2018

From Henderson-Hasselbalch equation:

PH = Pka + ㏒[conjugate base / weak acid]

when C2H3O2 is the conjugate base

and HC2H3O2 is the weak acid

so,
PH = Pka + ㏒[C2H3O2]/[HC2H3O2]

by substitution:

4.34 = 4.74 + ㏒[C2H3O2][HC2H3O2]

∴[C2H3O2]/[HC2H3O2] = 0.4

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