BaCl₂ + Na₂CO₃ → 2NaCl + BaCO₃↓;
Ba²⁺ + 2Cl⁻ + 2Na⁺ + CO₃²⁻ → 2Na⁺ + 2Cl⁻ + BaCO₃↓;
Ba²⁺ + CO₃²⁻ → BaCO₃↓.
Na₂CO₃ + 2HCl → 2NaCl + CO₂↑ + H₂O;
2Na⁺ + CO₃²⁻ + 2H⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CO₂↑ + H₂O;
CO₃²⁻ + 2H⁺ → CO₂↑ + H₂O.
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BaCl₂ + Na₂CO₃ → 2NaCl + BaCO₃↓;
Ba²⁺ + 2Cl⁻ + 2Na⁺ + CO₃²⁻ → 2Na⁺ + 2Cl⁻ + BaCO₃↓;
Ba²⁺ + CO₃²⁻ → BaCO₃↓.
Na₂CO₃ + 2HCl → 2NaCl + CO₂↑ + H₂O;
2Na⁺ + CO₃²⁻ + 2H⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CO₂↑ + H₂O;
CO₃²⁻ + 2H⁺ → CO₂↑ + H₂O.