Na₂SO₃ + 2H₂SO₄ = 2NaHSO₄ + SO₂↑ + H₂O
1)2Na⁺ + SO₃²⁻ + 4H⁺ + 2SO₄²⁻ = 2Na⁺ + 2HSO₄⁻ + SO2↑ + H2O
2)SO₃²⁻ + 4H⁺ + 2SO₄²⁻ = 2HSO₄⁻ + SO₂↑ + H₂O
2)OH⁻ + H⁺ = H₂0
AgNO₃ + NaCl = NaNO₃ + AgCl↓ 1)Ag⁺ + NO₃⁻ + Na⁺ + Cl⁻ = Na⁺ + NO₃⁻ + AgCl↓ 2)Ag⁺ + Cl⁻ = AgCl↓
Na₂SO₃ + 2H₂SO₄ = 2NaHSO₄ + SO₂↑ + H₂O
1)2Na⁺ + SO₃²⁻ + 4H⁺ + 2SO₄²⁻ = 2Na⁺ + 2HSO₄⁻ + SO2↑ + H2O
2)SO₃²⁻ + 4H⁺ + 2SO₄²⁻ = 2HSO₄⁻ + SO₂↑ + H₂O