A.Ca(HCO 3 ) 2 溶液中加入少量NaOH溶液:Ca 2+ +2HCO 3 - +2OH - =CaCO 3 ↓+CO 3 2 - +H 2 O |
B.磁性氧化铁溶于稀硝酸:3Fe 2 + +4H + +NO 3 - 3Fe 3 + +NO↑+3H 2 O |
C.向含有0.4 mol FeBr 2 的溶液中通入0.3 mol Cl 2 充分反应:4 Fe 2+ +2 Br - +3Cl 2 =4Fe 3+ +6Cl - +Br 2 |
D.以铜为电极电解饱和食盐水:2Cl - +2H 2 O Cl 2 ↑+H 2 ↑+2OH - |