25℃时,在25 mL 0.1 mol/L的NaOH溶液中,逐滴加入0.2 mol/L的CH3COOH溶

25℃时,在25 mL 0.1 mol/L的NaOH溶液中,逐滴加入0.2 mol/L的CH3COOH溶液,溶液的pH与醋酸体积关系如右图,下列分析正确的是                                   (    )

      A.B点的横坐标a=12.5

      B.C点时溶液中有:c(Na+)>c(CH3COO-)>c(H+)>c(OH-

       C.D点时溶液中有:c(CH3COO-)+c(CH3COOH)=2c(Na+

       D.曲线上A、B间的任意一点,溶液中都有:c(CH3COO-)>c(Na+)>c(OH-)>c(H+

 

答案

C

解析:

 

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