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An aqueous solution contains 0.480 M acetic acid. How many mL of 0.327 M potassium hydroxide...

An aqueous solution contains 0.480 M acetic acid. How many mL of 0.327 M potassium hydroxide would have to be added to 250 mL of this solution in order to prepare a buffer with a pH of 4.680?

(please explain. thank you!)

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