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How many grams of solid potassium fluoride should be added to 2.00 L of a 0.279 M hydrofluoric acid solution to prepare a buffer with

How many grams of solid potassium fluoride should be added to 2.00 L of a 0.279 M hydrofluoric acid solution to prepare a buffer with a pH of 4.083? (Ka (HF) = 7.20 x 10^-4)

Mass = ________ g

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