A diprotic acid, H2A, has the following acid dissociation constants: Ka1 = 1.1 x 10-3 and Ka2 = 2.5 x 10-6. Which combination of species would you use to make a buffer solution whose pH is 5.80? A)  NaHA/H2A B)  Na2A/NaHA C)  H2A/NaHA/Na2A D)  H2A/Na2A E)  H2A and its conjugates cannot be used to form a buffer of pH = 5.80

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