Ionisation of weak bases – degree of ionisation

2016 Phase II 1 question

1. 1 Equilibrium
   The percentage of pyridine ($C_5H_5N$) that forms pyridinium ion ($C_5H_5N^+H$) in a 0.10 M aqueous pyridine solution ($K_b$ for $C_5H_5N = 1.7 \times 10^{-9}$) is
   A 0.77% B 1.6% C 0.0060% D 0.013%
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