Cu=>CuO=>CuSO₄=>Cu(OH)₂
2Cu + O₂=2CuO
CuO + H₂SO₄=CuSO₄+ H₂O
CuSO₄+ 2NaOH=Cu(OH)₂↓ + Na₂SO₄
Cu²⁺ + SO₄²⁻ + 2Na⁺ + 2OH⁻ = Cu(OH)₂↓ + 2Na⁺ + SO₄²⁻
Cu²⁺ + 2OH⁻ = Cu(OH)₂↓