Assume you have a 0.30 M solution of formic acid?

Question

(HCOOH) and add enough sodium formate (NaHCOO) to make the solution 0.10 M in the salt. Calculate the pH of the formic acid solution before and after adding sodium formate.

Answer 1

HCOOH <----> HCOO- + H+

1.8 x 10^-4 = x^2 / 0.30-x

x = [H+] = 0.0073 M

pH = 2.1