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阿Q吧 > 常温下，有甲、乙两份体积为1L、浓度均为0.1mol．?L-1的醋酸溶液，其pH为3，①甲用蒸馏水稀释100倍后，溶

常温下，有甲、乙两份体积为1L、浓度均为0.1mol．?L-1的醋酸溶液，其pH为3，①甲用蒸馏水稀释100倍后，溶

2025-04-06 21:34:53

推荐回答（1个）

回答1：

醋酸为弱电解质，加水稀释促进电离，0.1mol/L的醋酸用蒸馏水稀释100倍后，溶液的3＜pH＜5，
与等体积、浓度为0.2mol/L的NaOH混合，
根据电荷守恒可知：n（Na⁺）+n（H⁺）=n（OH^-）+n（CH₃COO^-），
则n（CH₃COO^-）+n（OH^-）-n（H⁺）=n（Na⁺）=ymol，
n（Na⁺）=0.2mol/L×1L=0.2mol，
所以y=0.2，
故选D．

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