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Given the Ka of the following acids, which combination of substance would be best suited to prepare a buffer of pH 3.5?

Given the Ka of the following acids, which combination of substance would be best suited to prepare a buffer of pH 3.5?
CH3CO2H = 1.8 x 10-5 HCO2H = 1.8 x 10-4 H3PO4 = 7.5 x 10-3

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