Cu-CuS-CuO-CuSO4-Cu(OH)2-CuO
Cu-CuS-CuO-CuSO4-Cu(OH)2-CuO Cu + S = CuS 2CuS + 3O₂ = 2CuO + 2SO₂ CuO + H₂SO₄ = CuSO₄ + H₂O CuSO₄ + 2NaOH = Cu(OH)₂ + Na₂SO₄ Cu(OH)₂ = CuO + H₂O (t)