How many grams of sodium formate hcoona must be dissolved, Ask an Expert

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How many grams of sodium formate (HCOONa) must be dissolved in a 0.250 M solution of formic acid (HCOOH) to make 500.0 ml of a buffer solution with a pH=4.60? Assume the volume of the solution remains constant when you add the sodium formate. Ka =1.8x10^-4.

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