Homework Help: Science (Chemistry)

Posted by Taylor on Monday, March 12, 2012 at 3:25am.

How many grams of dry NH4Cl need to be added to 1.90 L of a 0.200 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.99? Kb for ammonia is1.8*10^-5.

Can anyone help me with this question? I have no idea how to solve it.

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