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What amount of HCl should be added to 1.00 L of 1.25 M pyridine (C5H5N, Kb = 1.7109) to give a buffer solution with pH

What amount of HCl should be added to 1.00 L of 1.25 M pyridine (C5H5N, Kb = 1.7×10–9) to give a buffer solution with pH = 5.50?

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