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Suppose that you wanted to prepare a acetate ion /?acetic acid buffer solution with a pH of 4.35. What is the value of [A-?] /?[HA] for the correct buffer solution for this event? The Ka for acetic acid is 1.8 × 10-5.

Choose one answer.
a. 0.39
b. 0.407
c. 0.372
d. 4.74

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