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What volume (in mL) of a 0.50 M NH4Cl solution must be added to 50.0 mL...

What volume (in mL) of a 0.50 M NH4Cl solution must be added to 50.0 mL of a 0.50 M NH3 solution in order to prepare a buffer with a pH of 9.5? (Kb of NH3 is 1.8 × 10-5)

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