# Write the reaction equation Ca → Ca (OH) 2 → CaCo3 → CaO → Ca (OH) 2 → CaCl2

1. Reaction of calcium with water displacing hydrogen:
Ca + 2H2O = Ca (OH) 2 + H2.
2. Reaction with carbon dioxide dissolved in water:
Ca (OH) 2 + CO2 = CaCO3 + H2O.
Or with carbon monoxide at 400 ° C
Ca (OH) 2 + CO = CaCO3 + H2.
3. The reaction of decomposition of calcium carbonate when heated:
CaCO3 = CaO + CO2.
4. Slaking of lime, exothermic reaction, at a temperature above 580 ° C the reaction is reversible:
CaO + H2O = Ca (OH) 2.
5. Heating calcium hydroxide with ammonium chloride:
Ca (OH) 2 + 2NH4Cl = 2NH3 + CaCl2 + H2O.
Or the action of chloramine heated hydroxide:
Ca (OH) 2 + 2Cl2 = Ca (ClO) 2 + CaCl2 + 2H2O.

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