往纯水中加入下列物质,能使水的电离平衡发生移动的是(    ) A.蔗

往纯水中加入下列物质,能使水的电离平衡发生移动的是(    )

A.蔗糖              B.NaOH              C.酒精                 D.CH3COOH

答案

解析:蔗糖和乙醇均属于非电解质,尽管两者的溶解度很大(乙醇与水能以任意比混溶),但是却不会电离,因此对于氢离子和氢氧根离子的浓度均没有影响,所以不影响水的电离,而氢氧化钠和醋酸却会因各自电离出的氢氧根离子和氢离子而明显改变溶液中两种粒子的浓度,进而使水的平衡发生移动。

答案:BD

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