(10分,每空2分) (1)CaCO 3 +2H + =Ca 2++ CO 2↑+H 2O
(2)Zn+2H + = Zn 2++H 2↑ (3)Ba 2+ + 2OH - + Cu 2+ +SO 4 2+= BaSO 4 ↓+ Cu(OH) 2 ↓
(4)Zn+ Cu 2+ = Cu+ Zn 2+ (5)H ++ OH -= H 2O
(10分,每空2分) (1)CaCO 3 +2H + =Ca 2++ CO 2↑+H 2O
(2)Zn+2H + = Zn 2++H 2↑ (3)Ba 2+ + 2OH - + Cu 2+ +SO 4 2+= BaSO 4 ↓+ Cu(OH) 2 ↓
(4)Zn+ Cu 2+ = Cu+ Zn 2+ (5)H ++ OH -= H 2O