Fe→Fe₃O₄→Fe→FeCl₂→Fe(OH)₂:
1, 3, 4, 2
3Fe+2O₂=Fe₃O₄
Fe₃O₄+2C=3Fe+2CO₂↑
Fe+2HCI=FeCl₂+H₂
FeCl₂+2NaOH=Fe(OH)₂↓+2NaCI
Fe→Fe₃O₄→Fe→FeCl₂→Fe(OH)₂:
1, 3, 4, 2
3Fe+2O₂=Fe₃O₄
Fe₃O₄+2C=3Fe+2CO₂↑
Fe+2HCI=FeCl₂+H₂
FeCl₂+2NaOH=Fe(OH)₂↓+2NaCI