已知 H 3 AsO 4 的 p K a1 = 2.2, p K a2 = 6.9, p K a3 = 11.5, 则在 pH=7.0 时 , 溶液中 [H3 AsO 4 ]/[AsO 4 3- ]约 等于 ( )
A.
10 0.4
B.
10 -0.4
C.
10 -5.2
D.
10 -4.8
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参考答案:
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