取浓度相同的NaOH和HCl溶液,以3∶2体积比相混合,所得溶液的pH等于1

取浓度相同的NaOHHCl溶液,以32体积比相混合,所得溶液的pH等于12,则原溶液的浓度为(  )

A0.01 mol/L        B0.017 mol/L

C0.05 mol/L               D0.50 mol/L

答案

解析:设原溶液物质的量浓度为c

混合溶液中c(OH)102 mol/L

则有102 mol/L,则c0.05 mol/L

答案:C

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