Write the reaction equations for obtaining calcium carbonate in all possible ways.

Calcium carbonate – the average salt of carbonic acid is insoluble in water.
Ways to get it:
1. Industrial:
CaO + H2O = Ca (OH) 2 – hydration reaction;
Ca (OH) 2 + CO2 = CaCO3 + H2O – compounds;
2. In the laboratory:
CaO + CO2 = CaCO3 – compounds;
Ca (OH) 2 + Na2CO3 = CaCO3 + 2NaOH – exchange;
CaCL2 + Na2CO3 = CaCO3 + 2NaCL – exchange;
K2CO3 + Ca (OH) 2 = CaCO3 + 2KOH – exchange.
Salt calcium carbonate occurs naturally in the form of minerals: chalk, marble, limestone and is used in construction, as well as an additive to the soil to restore acid-base balance.