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How many grams of dry NH4Cl need to be added to 2.50 L of a 0.500...

How many grams of dry NH4Cl need to be added to 2.50 L of a 0.500 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.69? Kb for ammonia is 1.8×10−5?

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