Write the reaction equation: Ca – cao-cacl2- ca oh 2- ca co3- ca hco3 2- Caco3

1) 2Ca + O2 = 2CaO (when calcium interacts with oxygen, calcium oxide is formed);

2) CaO + 2HCl = CaCl2 + H2O (when calcium oxide interacts with hydrochloric acid, calcium chloride and water are formed);

3) CaCl2 + 2NaOH = Ca (OH) 2 + 2NaCl (when calcium chloride interacts with sodium hydroxide, calcium hydroxide and sodium chloride are formed);

4) Ca (OH) 2 + H2CO3 = CaCO3 + 2H2O (when calcium hydroxide interacts with carbonic acid, calcium carbonate and water are formed);

5) CaCO3 + H2CO3 = Ca (HCO3) 2 (when calcium carbonate interacts with carbonic acid, calcium bicarbonate is formed);

6) Ca (HCO3) 2 = CaCO3 + CO2 + H2O (when heated, calcium bicarbonate decomposes into calcium carbonate, carbon dioxide and water).