A weak base, pyridine, C₅H₅N has a concentration of 0.30M and a pH=9.38. Determine the Kb, and pKb for the dissociation reaction C₅H₅N(aq) + H₂Oₗ ⇌ C₅H₅NH⁺(aq) + OH−(aq).
a) Kb = 1.3 × 10⁻⁵, pKb = 4.88
b) Kb = 3.2 × 10⁻⁶, pKb = 5.50
c) Kb = 4.0 × 10⁻⁹, pKb = 8.40
d) Kb = 1.6 × 10⁻⁴, pKb = 3.80
