1. CuCl₂ + 2NaOH → Сu(OH)₂ + 2NaCl
Cu⁺² + 2Cl⁻ + 2Na⁺ + 2OH⁻ → Cu(OH)₂ + 2Na⁺ + 2Cl⁻
Cu⁺² + 2OH⁻ → Cu(OH)₂
2. K₂SO₃ + 2HNO₃ → 2KNO₃ + H₂O + SO₂
2K⁺ + SO₃⁻² + 2H⁺ + 2NO₃⁻ → 2K⁺ + 2NO₃⁻ + H₂O + SO₂
SO₃⁻² + 2H⁺ → H₂O + SO₂
3. Na₂CO₃ + CaBr₂ → 2NaBr + CaCO₃
Ca⁺² + 2Br⁻ + 2Na⁺ + CO₃⁻² → CaCO₃ + 2Br⁻ + 2Na⁺
Ca⁺² + CO₃⁻² → CaCO₃