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1) How many grams of solid ammonium chloride should be added to 1.50 L of a...

1) How many grams of solid ammonium chloride should be added to 1.50 L of a 0.273 M ammonia solution to prepare a buffer with a pH of 8.540 ?
2) How many grams of solid sodium hypochlorite should be added to 1.00 L of a 0.239 M hypochlorous acid solution to prepare a buffer with a pH of 8.109 ?

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