25. The pK_as of phosphoric acid are 2.1, 6.9, and 12.4. The ionic form that predominates at pH 7.5 is:
(A) H₃PO₄
(B) H₂PO₄^-
(C) HPO_4^2-
(D) PO₄^3-
(E) None of the above.

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