Write the reaction equation in molecular and ionic form BaCo3 arrow BaO arrow BaCl2.

Scheme of reaction equations: BaCO3 => BaO => BaCl2.
Explanation of the solution to the problem:
1. Thermal decomposition of barium carbonate at a temperature of about 1000-1450 ° C with the formation of barium oxide and carbon dioxide:
BaCO3 => BaO + CO2;
2. Interaction of basic barium oxide with hydrochloric acid to form barium chloride and a low-dissociated compound – water:
BaO + 2HCl => BaCl2 + H2O;
When drawing up ionic equations, gases that are insoluble in water and poorly dissociated compounds are not assigned to ions:
BaO + 2H ^ (+) + 2Cl ^ (-) => Ba ^ (+ 2) + 2Cl ^ (-) + H2O;
BaO + 2H ^ (+) => Ba ^ (+ 2) + H2O.