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Which acid would you choose to combine with its sodium salt to make a solution buffered...

Which acid would you choose to combine with its sodium salt to make a solution buffered at pH 4.2 For the best choice, calculate the ratio of the conjugate base to the acid required to attain the desired pH. Chlorous Acid (HClO2) pKa=1.95 Nitrous Acid (HNO2) pKa=3.34 Formic Acid (HCHO2) pKa=3.74 Hypochlorous Acid (HClO) pKa=7.54

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