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# 4B. How many grams of dry NH4Cl need to be added to 1.80 L of a...

4B. How many grams of dry NH4Cl need to be added to 1.80 L of a 0.100 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.93? Kb for ammonia is 1.8×10^−5. Express your answer with the appropriate units.

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