The base aniline, C₆H₅NH₂, has a pKb equal to 9.37. Calculate the hydroxide concentration, the pH, and the % ionization for a 0.14 M solution.
a) [OH-] = 4.7 × 10⁻10 M, pH = 9.33, % ionization = 0.02%
b) [OH-] = 2.6 × 10⁻5 M, pH = 8.59, % ionization = 0.0001%
c) [OH-] = 1.2 × 10⁻9 M, pH = 5.32, % ionization = 0.03%
d) [OH-] = 7.1 × 10⁻8 M, pH = 6.15, % ionization = 0.001%