A.
硫化亚铁溶于稀硝酸中: FeS + 2H + == =Fe 2 + + H 2 S ↑
B.
NH 4 HCO 3 溶于过量的 NaOH 溶液中: HCO 3 ( - ) + OH - == =CO 3 ( 2- ) + H 2 O
C.
少量 SO 2 通入苯酚钠溶液中: C 6 H 5 O - + SO 2 + H 2 O == =C 6 H 5 OH + HSO 3 ( - )
D.
大理石溶于醋酸中: CaCO 3 + 2CH 3 COOH == =Ca 2 + + 2CH 3 COO - + CO 2 ↑ + H 2 O