NaOH + HCl = NaCl + H2O
Na⁺ + OH⁻ + H⁺ + Cl⁻ = Na⁺ + Cl⁻ + H₂O
OH⁻ + H⁺ = H₂O
Zn + 2HCl = ZnCl₂ + H₂
Zn + 2H⁺ + 2Cl⁻ = Zn⁺² + 2Cl⁻ + H₂↑
Zn + 2H⁺ = Zn⁺² + H₂↑
CuSO₄ + 2NaOH = Cu(OH)₂↓ +Na₂SO₄
Cu⁺² + SO₄⁻² + 2Na⁺ + 2OH⁻ = Cu(OH)₂↓ + 2Na⁺ + SO₄⁻²
Cu⁺² + 2OH⁻ = Cu(OH)₂↓