室温下向10mL 0.1mol•L﹣1NaOH溶液中加入0.1mol•L﹣1的一元酸HA，溶液pH的变化曲线如图所示，下列说法正确的是

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室温下向10mL 0.1mol•L^﹣1NaOH溶液中加入0.1mol•L^﹣1的一元酸HA，溶液pH的变化曲线如图所示，下列说法正确的是（）

A：a点所示溶液中c（Na⁺）＞c（A^﹣）＞c（H⁺）＞c（OH^﹣）

B：a、b两点所示溶液中水的电离程度相同

C：pH=7时，c（Na⁺）=c（A^﹣）+c（HA）

D：b点所示溶液中c（A^﹣）＞c（HA）

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D

B

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