試題詳解

16. In a 0.10-M aqueous solution of pyridine (Kь = 1.7 × 10^-9), the percentage of pyridine (C₅H₅N) that forms pyridinium ion, C₅H₅NH⁺, is _____%.
(A) 0.013
(B) 6.4
(C) 4.2
(D) 1.3
(E) 5.5