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Phosphoric Acid Is Tribasic, with PKa's of 2

Question 22

Multiple Choice

Phosphoric acid is tribasic, with pKa's of 2.14, 6.86, and 12.4. The ionic form that predominates at pH 3.2 is:


A) H3PO4.
B) H2PO4-.
C) HPO42-.
D) PO43-.
E) None of the answers is correct.

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