在K2SO4、Al2(SO4)3和明矾[KAl(SO4)2·12H2O]的混合液中,SO42-浓度为0.2mol/L,当加入等体积0.4mol/L的KOH溶液时,生成的沉淀恰好完全溶解。则反应后溶液中K+的浓度约为( )
A.0.45mo1/L | B.0.25mol/L | C.0.225mol/L | D.0.9mol/L |
在K2SO4、Al2(SO4)3和明矾[KAl(SO4)2·12H2O]的混合液中,SO42-浓度为0.2mol/L,当加入等体积0.4mol/L的KOH溶液时,生成的沉淀恰好完全溶解。则反应后溶液中K+的浓度约为( )
A.0.45mo1/L | B.0.25mol/L | C.0.225mol/L | D.0.9mol/L |