Question

An analytical balance was used to weigh 200.01 mg of dry solid sodium acetate {NaC2H3O2 ~ NaAc MW = 82.0343, pKa (HC2H3O2 ~ HAc) = 4.76} which was transferred to a 100.00 mL volumetric flask that was then filled to the line with carbonate-free water and mixed well. Determine the pH of each of the solutions below.
A.) The original sodium acetate solution
B.) A 25.00 mL aliquot of the NaAc solution plus 25.00 mL of 0.100 M aqueous acetic acid (HAc) solution
C.) A 25.00 mL aliquot of the NaAc solution plus 15.00 mL of 0.100 M aqueous hydrogen chloride solution

Answer 1

B seems most correct