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    Diprotic has constants Ka1 and Ka2, what is the combination and pKa

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    A diprotic acid, H2A, has the following ionization constants: Ka1=1.1E-3 and Ka1=2.5E-6. In order to make up a buffer solution of pH 5.80, which combination would you choose: NaHA/H2A or NA2A/NaHA?
    I know this is NA2A/NaHA, but don't know why.
    What is the pKa of the component?

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