A Solution of Aniline (C₆H₅NH₂,K_b = 4

Multiple Choice

A solution of aniline (C₆H₅NH₂,K_b = 4.2 × 10^-10) has a pH of 8.56 at 25^oC.What was the initial concentration of aniline?

A) 2.8 × 10^-9 M
B) 2.1 × 10^-8 M
C) 3.2 × 10^-2 M
D) 4.2 × 10^-10 M
E) 3.6 × 10^-6 M