用石墨作电极,电解1 mol/L下列物质的溶液,溶液的pH保持不变的是(

用石墨作电极,电解1 mol/L下列物质的溶液,溶液的pH保持不变的是(    )

AHCl          BNaOH

CNa2SO4                 DNaCl

答案

【答案】C

【解析】电解HCl溶液生成氢气和氯气,溶质减少,pH增大;电解NaOH溶液实质是电解水,NaOH溶液浓度增大,pH也增大;电解NaCl溶液生成NaOHpH增大。

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