H3PO4 has pKa1 = 8.1, pKa2 = 7.1 and pKa3 = 12.3. At what pH does...

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Question

H3PO4 has pKa1 = 8.1, pKa2 = 7.1 and pKa3 = 12.3. At what pH does [H3PO4] = [H2PO4-]?

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