下列溶液中,当pH相等时浓度最大的是(    ) A.HCl            

下列溶液中,当pH相等时浓度最大的是(    )

A.HCl                                           B.H2SO4

C.CH3COOH                                D.HNO3

答案

C

解析:pH相等即c(H+)相等,在四个选项中,HCl、HNO3为一元强酸,完全电离,H2SO4为二元强酸,完全电离,只有CH3COOH为一元弱酸,不完全电离,故c(H+)相等时CH3COOH浓度最大。

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