make 200.0 mL of a pH 5.00 buffer from 0.200 M acetic acid and 0.100 M sodium acetate. Calculate the volume of 0.200 M acetic acid and the volume of 0.100 M sodium acetate required to make 200.0 mL of a buffer solution with pH = 5.00.

Question

The Ka for acetic acid at 298 K is 2.00 x 10-5.

Answer 1

Let x = mL base
pH = pKa + log(base)/(acid)
5.00 = 4.699 + log(0.1x)/(200-x)*0.2
Solve for x and 200-x