What do you expect to be the pH of a acetateacetic acid buff

What do you expect to be the pH of a acetate-acetic acid buffer in water if equal amounts of each are used?

Solution

mixture of acetate and acetic acid act as acidic buffer.

for acidic buffer

pH = pKa + log [acetate] / [acetic acid]

[acetate] = [acetic acid]

log [acetate] / [acetic acid] = 0

so

pH = pKa