Ca→Ca(OH)2→CaCO3→CaO→CaCI2→CaCO3
1. Ca + 2H₂O = Ca(OH)₂ + H₂ 2. Ca(OH)₂ + CO₂ = CaCO₃ + H₂O 3. CaCO₃ =(t)= CaO + CO₂ 4. CaO + 2HCl = CaCl₂ + H₂O 5. CaCl₂ + Na₂CO₃ = CaCO₃ + 2NaCl