Ba–BaO–Ba(OH)2–BaCO3–Ba(NO3)2 | Ba(ON)2–BaO–BaCl2
1) 2Ba + O₂ = 2BaO 2) BaO + H₂O = Ba(OH)₂ 3) Ba(OH)₂ + СО2= BaCO₃↓ + Н2О 4) BaCO₃ + 2HNO₃ = H₂O + CO₂ + Ba(NO₃)₂ 5) Ba + 2H2О = Ba(ОН)₂ + H₂ 6) Ba(ОН)₂ → BaO + Н2О 7) BaO + 2HCI = BaCI₂ + H₂O