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1) 4Al + 3O₂ = 2Al₂O₃
2) Al₂O₃ + 6HCl = 2AlCl₃ + 3H₂O
3) AlCl₃ + 3KOH = Al(OH)₃ + 3KOH
4) Al(OH)₃ + 3NaOH = Na₃AlO₃ + 3H₂O
5) Al(OH)₃ + 3HNO₃ = Al(NO₃)₃ + 3H₂O