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What is the pH of a 0.30 M pyridine solution that has a Kb = 1.9 × 10^-9? The equation for the dissociation of pyridine is C5H5N(aq) + H2O(l) ⇌ C5H5NH+(aq) +OH-(aq). A) 4.62 B) 9.38 C) 10.38 D) 8.72