Problem- how many grams of dry nh4cl need to be added to, Ask an Expert

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Problem- How many grams of dry NH4Cl need to be added to 1.90L of a 0.200M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.55? Kb for ammonia is 1.8*10^-5. Express your answer numerically in grams to three significant figures.

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