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A 0.500 L buffer solution is made with 0.4 M NH3 and 0.15 M NH4Cl with a pKb = 4.75. What is the initial pH

A 0.500 L buffer solution is made with 0.4 M NH3 and 0.15 M NH4Cl with a pKb = 4.75. What is the initial pH of this buffer? What is the pH of the solution after the addition of 15.0 mL of 0.1 M HCl solution?

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