常温下,用0.1000mol/L的NaOH溶液滴定20mL同浓度的一元弱酸HA,滴定

 


常温下,用0.1000mol/LNaOH溶液滴定20mL同浓度的一元弱酸HA,滴定过程溶液pHNaOH溶液的体积的变化曲线如图所示(忽略中和热效应)。下列说法不正确的是    

A.常温下,HA的电离常数K(HA)约为10-5

Bv1<20

C.溶液中水的电离程度:a>b

D.滴定过程为了确定滴定终点,最合适的指示剂是酚酞

答案

C

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