2Ca + O₂ → 2CaO
CaO + H₂O → Ca(OH)₂
Ca(OH)₂ + SO₂ → CaSO₃ + H₂O
CaSO₃ + 2HCl → CaCl₂ + SO₂↑ + H₂O
CaCl₂ + 2NaOH → Ca(OH)₂↓ + 2NaCl
2Ca + O₂ → 2CaO
CaO + H₂O → Ca(OH)₂
Ca(OH)₂ + SO₂ → CaSO₃ + H₂O
CaSO₃ + 2HCl → CaCl₂ + SO₂↑ + H₂O
CaCl₂ + 2NaOH → Ca(OH)₂↓ + 2NaCl