除去下列各组物质中的杂质(括号内为杂质),在横线上写出所发生的化学方程式及方法。 (1)KNO3(CuSO4)_________________________; (2)CO(CO2)__________________; (3)NaOH[Ca(OH)2]__________________________; (4)NaOH(Na2SO4)___________; (5)KNO3(K2CO3)_________________________; (6)H2(HCl)__________________; (7)KNO3(NaCl)__________________________; (8)CaO(CaCO3)______________; |