How many moles of nac2h3o2 must be added to a solution

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Problem- A solution buffered at a pH of 5.00 is needed in an experiment. Can we use acetic acid and sodium acetate to make it? if so, how many moles of NaC2H3O2 must be added to 1.0L of a solution that contains 1.0 mol HC2H3O2 to prepare the buffer? Ka of acetic acid is 1.8x10^.5

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