下列物质中,括号内为杂质,需要选取试剂除去杂质,请将选用的试

下列物质中,括号内为杂质,需要选取试剂除去杂质,请将选用的试剂填在相应的横线上。

(1)KNO3(KOH) ______________________________

(2)NaCl(CaCl2) ______________________________

(3)K2SO3(CaCO3) ______________________________

(4)K2SO4(K2CO3) ______________________________

(5)Na2SO4(Na2CO3) ______________________________

(6)NaHCO3(Na2CO3) ______________________________

答案

(1)HNO3  (2)Na2CO3  (3)H2O  (4)稀H2SO4  (5)稀H2SO4  (6)CO2,H2O

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