The pKₐs of phosphoric acid are 2.1,7.2,and 12.Which of the following ionic form(s) of phosphoric acid is/are present at pH 7.0?
A) HPO4-2
B) H₂PO4-
C) HPO4-2 and PO4-3
D) H₂PO4- and HPO4-2
Correct Answer:
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