You Have a 250 $\times$ 10^-5)

Multiple Choice

You have a 250.-mL sample of 1.28 M acetic acid (K_a = 1.8 $\times$ 10^-5) .Calculate the pH of the best buffer.

A) 7.00
B) 4.74
C) 4.25
D) 9.26
E) none of these