The base-dissociation constant, K_b, for pyridine, C₅H₅N, is 1.4 × 10^-9. The acid-dissociation constant, K_a, for the pyridinium ion, C₅H₅NH⁺, is ________. A)1.0 × 10^-7 B)1.4 × 10^-23 C)7.1 × 10^-4 D)1.4 × 10^-5 E)7.1 × 10^-6

Question

Quizplus · Accepted Answer

The relationship between Kb and Ka for a conjugate acid-base pair is given by the equation Ka × Kb = Kw, where Kw is the ion-product constant of water (1.0 × 10^-14 at 25°C). Solving for Ka gives Ka = Kw / Kb = (1.0 × 10^-14) / (1.4 × 10^-9) = 7.1 × 10^-6.

The Base-Dissociation Constant, Kb, for Pyridine, C5H5N, Is 1

The Base-Dissociation Constant, K_b, for Pyridine, C₅H₅N, Is 1