(6分)写出除杂反应方程式(括号内的物质为杂质)。
(1)FeSO4(CuSO4)________________________________________________
(2)CaO(CaCO3) _______________________________________________
(3)NaOH(Na2CO3)______________________________________________
(4)HNO3 (HCl) _______________________________________________
(5)KNO3(K2SO4) _______________________________________________
(6)NaCl(NH4Cl) _______________________________________________