What Is the PH of an Aqueous Solution That Contains

Multiple Choice

What is the pH of an aqueous solution that contains 0.39 M C₆H₅COOH and 0.14 M C₆H₅COONa?
K _a(C₆H₅COOH) = 6.3×10 ^{- 5}

A) pH = 0.409
B) pH = 3.76
C) pH = 4.65
D) pH = 6.29
E) pH = 8.65