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What is the pH of a 0.25M solution of sodium formate, the conjugate base of formic...

What is the pH of a 0.25M solution of sodium formate, the conjugate base of formic acid, assiuming activity coefficients of 1.0? The pKa for formic acid (HCOOH) is 3.74.

B + H20 = BH+ + OH-

Kb= [BH+][OH-] / B

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