1. K₂CO₃ + H₂SO₄ = K₂SO₄ + CO₂ + H₂O
2K⁺ + CO₃²⁻ + 2H⁺ + SO₄²⁻ = 2K⁺ + SO₄²⁻ + CO₂ + H₂O
2H⁺ + CO₃²⁻ = CO₂ + H₂O
2. KOH + HCl = KCl + H₂O
K⁺ + OH⁻ + H⁺ + Cl⁻ = K⁺ + Cl⁻ + H₂O
H⁺ + OH⁻ = H₂O
3. BaCl₂ + H₂SO₄ = BaSO₄↓ + 2HCl
Ba²⁺ + 2Cl⁻ + 2H⁺ + SO₄²⁻ = BaSO₄↓ + 2H⁺ + 2Cl⁻
Ba²⁺ + SO₄²⁻ = BaSO₄