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Which of the following would best buffer a solution from a pH of 4 to 6?

a. Hydrocyanic acid (pKa - 9.2)

Ob. Formic acid (pKa - 3.7)

cCarbonic acid (pKa - 6.3

d. Acetic acid (pKa= 4.7)

e. Uric acid (pKa=3.9)


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