1) Barium reacts with oxygen and forms – barium oxide:
2Ba + O2 → 2BaO;
2) When barium oxide interacts with calcium hydroxide, barium hydroxide precipitates and calcium oxide is obtained:
BaO + Ca (OH) 2 ↓ → Ba (OH) 2 ↓ + CaO;
3) Barium hydroxide decomposes into barium oxide and water:
Ba (OH) 2 ↓ → BaO + H2O.
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