6. What is the dominant form of triprotic acid at a pH of 6.50? (pKa1=1.99, pKa2=3.85,pKa3=9.89) (3%)
(A) H2A-
(B) HA2-
(C) A3-
(D) HA2- and H2A- are equal
(E) A3- and HA2- are equal

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