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Chemistry

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I am having trouble with how to approach this problem. I have the solution but can't figure out how to get it.
How many moles of NaOH must be added to 1.0 L of 2.0M HC2H3O2 to produce a solution buffered at each pH?
a) pH=pKa
b)pH=4
c)ph=5

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    Read your textbook thoroughly.

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