常温下,下列溶液中各离子浓度关系表述正确的是(     ) A. 

 常温下,下列溶液中各离子浓度关系表述正确的是(    

A.       NH4HSO4溶液中逐滴加入NaOH溶液至中性,溶液中

c(Na+)   >   c(SO42-)   >   c(NH4+)   >   c(H+)   =   c(OH-)

B.       等物质的量浓度的Na2 CO3,NaHCO3混合溶液中

c(Na+)   >   c(CO32-)   >c(HCO3-)   >      c(OH-)   >   c(H+)

C.      已知酸性HF > CH3COOH,pH相等的NaFCH3COOK溶液中

c(Na+ c(F-)   <   c(K+)   c(CH3COO-

D.      0.1mol/L Na2S溶液中 c(H+)   +   c(HS-)   +   c(H2S)     =   c(OH-)

答案

A

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