问题:
[单选题]
在磷酸盐溶液中,H2PO4-浓度最大时的pH是() (已知H3PO4的解离常数pKa1 = 2.12,pKa2 = 7.20,pKa3 = 12.36)
A4.66
B7.20
C9.78
D12.36
在磷酸盐溶液中,H2PO4-浓度最大时的pH是() (已知H3PO4的解离常数pKa1 = 2.12,pKa2 = 7.20,pKa3 = 12.36)
A4.66
B7.20
C9.78
D12.36
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