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How much 1N HCl should you add to 100 ml of a 10 mM solution of sodium acetate (pKa= 4.76) to obtain a pH= 4.76?

How much 1N HCl should you add to 100 ml of a 10 mM solution of sodium acetate (pKa= 4.76) to obtain a pH= 4.76?
answer is 0.5

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