Question: A diprotic acid, H2A, has the following ionization constants: Ka1 = 1.1 10-3 and Ka2 = 2.5 3 10-6. In order to make up

A diprotic acid, H2A, has the following ionization constants: Ka1 = 1.1 × 10-3 and Ka2 = 2.5 3 10-6. In order to make up a buffer solution of pH 5.80, which combination would you choose? NaHA/H2A or Na2A/NaHA.

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