The base-dissociation constant, K b, for pyridine (C 5H 5N) is 1.4 × 10 −9. The acid-dissociation constant, K a, for the pyridinium ion (C 5H 5NH +) is __________.
A) 1.4 × 10 −23
B) 1.0 × 10 −7
C) 7.1 × 10 −4
D) 7.1 × 10 −6
E) 1.4 × 10 −5
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