CuSO₄ + 2NaOH = Cu(OH)₂↓ + Na₂SO₄ Cu²⁺ + SO₄²⁻ + 2Na⁺ + 2OH⁻ = Cu(OH)₂↓ + 2Na⁺ + SO₄²⁻ Cu²⁺ + 2OH⁻ = Cu(OH)₂↓