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

A.HCl         B.NaOH             C.Na2SO4           D.NaCl

 

答案

C

解析:

 

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