Al → Al₂O₃ → Na[Al(OH)₄ ] → AlCl₃ → Al(NO₃)₃ → Al(OH)₃ → Al₂O₃.
4Al + 3O₂ = 2Al₂O₃.
Al₂O₃ + 2NaOH + 3H₂O = 2Na[Al(OH)₄];
Al₂O₃ + 2Na⁺ + 2OH⁻ + 3H₂O = 2Na⁺ + 2[Al(OH)₄];
Al₂O₃ + 2OH⁻ + 2H₂O = 2[Al(OH)₄].
Na[Al(OH)₄] + 4HCl = AlCl₃ + NaCl + 4H₂O;
Na⁺ + [Al(OH)₄] + 4H⁺ + 4Cl⁻ = Al³⁺ + 3Cl⁻ + Na⁺ + Cl⁻ + 4H₂O;
[Al(OH)₄] + 4H⁺ = Al³⁺ + 4H₂O.
AlCl₃ + 3AgNO₃ = Al(NO₃)₃ + 3AgCl↓;
Al³⁺ + 3Cl⁻ + 3Ag⁺ + 3NO₃⁻ = Al³⁺ + 3NO₃⁻ + 3AgCl↓;
3Cl⁻ + 3Ag⁺ = 3AgCl↓;
Cl⁻ + Ag⁺ = AgCl↓.
2Al(NO₃)₃ + 3Ba(OH)₂ = 2Al(OH)₃↓ + 3Ba(NO₃)₂;
2Al³⁺ + 6NO₃⁻ + 3Ba²⁺ + 6OH⁻ = 2Al(OH)₃↓ + 3Ba²⁺ + 6NO₃⁻;
2Al³⁺ + 6OH⁻ = 2Al(OH)₃↓;
Al³⁺ + 3OH⁻ = Al(OH)₃↓.
2Al(OH)₃ = Al₂O₃ + 3H₂O.