⊕ Mg - Mg(OH)₂ - MgCl₂ - MgSiO₃
1) Mg + 2H₂O = 2Mg(OH)₂ + H₂↑
2) Mg(OH)₂+2HCL = MgCl₂ + 2H₂O
3) MgCl₂ + H₂SiO₃ = MgSiO₃ + 2HCl
⊕Al - Al₂(SO₄)₃ - AlCl₃ - Al(OH)₃ - Al₂O₃ - AlBr₃
1) 2Al + 3H₂SO₄ = Al₂(SO₄)₃+3H₂↑
2) Al₂(SO₄)₃ + 3BaCl₂ = 2AlCl₃+3BaSO₄
3) AlCl₃ + 3NaOH = Al(OH)₃+3NaCl
4) 2Al(OH)₃ = Al₂O₃+3H₂O
5) Al₂O₃ + 6HBr = 2AlBr₃ +3H₂O