Calcium carbonate decomposes into calcium oxide and carbon dioxide:
CaCO3 ↓ → CaO + CO2;
Carbon dioxide reacts with calcium oxide, we get – calcium carbonate:
CO2 + CaO → CaCO3 ↓;
When calcium carbonate interacts with carbon dioxide and water, calcium bicarbonate is formed:
CaCO3 + CO2 + H2O → Ca (HCO3) 2;
When heated, calcium bicarbonate decomposes into calcium carbonate, carbon dioxide and water:
Ca (HCO3) 2 → CaCO3 + CO2 + H2O;
In the process of an exchange reaction between calcium carbonate and nitric acid, calcium nitrate, water and carbon dioxide are formed:
CaCO3 + 2HNO3 → Ca (NO3) 2 + H2O + CO2.
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