What is the pH of a 0.0175 M solution of pyridinium chloride (C₅H₅NHCl)? (K_b value for pyridine = 1.7 *10^-9)

Name: What is the pH of a 0.0175 M solution of pyridinium chloride (C 5 H 5 NHCl)? (K b value for pyridine = 1.7 *10 -9 )
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Quizplus · Accepted Answer

Pyridinium chloride is the salt of a weak base (pyridine) and a strong acid (HCl). The solution is acidic. Calculate the pH using the formula pH = 1/2(pKa - log C), where pKa = 14 - pKb. Here, pKb = 9, so pKa = 5. Therefore, pH = 1/2(5 - log 0.0175) ≈ 3.49.

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