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【单选题】
已知 H 3 PO 4 的pK a1 Ө =2.12, pK a2 Ө =7.20, pK a3 Ө =12.36, 则浓度均为0.1 mol ·L -1 的KH 2 PO 4 溶液和 K 2 H PO 4 溶液等体积混合后,溶液的PH值为A.
4.66
B.
9.78
C.
7.20
D.
12.36
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