P → P₂O₅ → H₃PO₄ → Ca(HPO₄) → Ca₃(PO₄)₂
4P+5O₂=2P₂O₅
P₂O₅
+3H₂O=2H₃PO₄
H₃PO₄ + Ca(OH)₂= Ca(HPO₄) + 2H₂O
2H₃PO₄ + 3Ca(OH)₂= Ca₃(PO₄)₂ + 6H₂O
AI->AICI₃->AI(OH)₃->AI₂(SO₄)₃->AI(NO₃)₃
2AI + 6HCI = 2AICI₃ +3H₂↑
AICI₃ + 3NaOH = 3NaCI + AI(OH)₃↓
2AI(OH)₃ + 3H₂SO₄ = AI₂(SO₄)₃ + 6H₂O
AI₂(SO₄)₃ + 3Ba(NO₃)₂ = 2AI(NO₃)₃ + 3BaSO₄↓
Fe₂O₃->FeCl₃->Fe(OH)₃->Fe₂(SO₄)₃
Fe₂O₃ + 6HCI = 2FeCl₃ + 3H₂O
FeCl₃ + 3NaOH = Fe(OH)₃↓ + 3NaCI
2Fe(OH)₃ + 3H₂SO₄= Fe₂(SO₄)₃ + 6H₂O