How many grams of dry nh4cl need to be added to 2.50 l of a 0.200 m solution of ammonia, nh3, to prepare a buffer solution that has a ph of 8.51? kb for ammonia is 1.8×10−5.?

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How manifold grams of dry nh4cl need to be borrowed to 2.50 l of a 0.200 m disentanglement of ammonia, nh3, to ad a buffer disentanglement that has a ph of 8.51? kb for ammonia is 1.8×10−5.?
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