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Given 15.75 mL of 0.230 M formic acid, HCOOH: a) How many milliliters of 0.450 M...

Given 15.75 mL of 0.230 M formic acid, HCOOH:
a) How many milliliters of 0.450 M potassium formate, KCO2H, must be added to produce a buffer with pH 3.95?
b) How many milliliters of 0.450 M KOH must be added to produce a buffer with pH 3.95?

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