Cu→ CuCl₂ → Cu(NO₃)₂→ Cu(OH)₂→CuO →CuSO₄ → CuCl₂→ Cu
Cu + Cl₂ = CuCl₂
CuCl₂ + 2AgNO₃ = Cu(NO₃)₂ + 2AgCl↓
Cu(NO₃)₂ +2NaOH = Cu(OH)₂ + 2NaNO₃
Cu(OH)₂ = CuO + H₂O
CuO + H₂SO₄ = CuSO₄ + H₂O
CuSO₄ + BaCl₂ = CuCl₂ + BaSO₄↓
CuCl₂ + Fe = FeCl₂ + Cu
Fe → FeCI₂→ Fe(OH)₂ → Fe(OH)₃→ Fe₂O₃ →FeCI₃ → Fe
Fe + 2HCl = FeCl₂ + H₂↑
FeCl₂ + 2NaOH = Fe(OH)₂ ↓+ 2NaCl
2Fe(OH)₂ + H₂O₂ = 2Fe(OH)₃↓
2Fe(OH)₃ = Fe₂O₃ + 3H₂O
Fe₂O₃ + 6HCl = 2FeCl₃ + 3H₂O
FeCl₃ + Cr = CrCl₃ + Fe