K --> K₂O --> KOH --> K₂SO₃
4K + O₂ = 2K₂O
K₂O + H₂O = 2KOH
2KOH + SO₂ = K₂SO₃ + H₂O
Ba --> BaO --> Ba(OH)₂ --> BaCl₂ --> AlCl₃
2Ba + O₂ = 2BaO
BaO + 2H₂O = Ba(OH)₂ + H₂
Ba(OH)₂ + 2HCl = BaCl₂ + 2H₂O
3BaCl₂ + Al₂(SO₄)₃ = 3BaSO₄ + 2AlCl₃
S --> SO₂ --> H₂SO₃ --> K₂SO₃
S + O₂ = SO₂
SO₂ + H₂O =H₂SO₃
H₂SO₃ + 2KOH = K₂SO₃ + 2H₂O
P --> P₂O₅--> H₃PO₄ --> Na₃PO₄
4P + 5O₂ = 2P₂O₅
P₂O₅ + 3H₂O = 2H₃PO₄
H₃PO₄ + 3NaOH = Na₃PO₄ + 3H₂O