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4Al + 3O₂ = 2Al₂O₃ Al₂O₃ + 6HCl = 2AlCl₃ + 3H₂O AlCl₃ +3KOH = Al(OH)₃ + 3H₂O 2Al(OH)₃ + Na₂O = 2NaAlO₂ + 3H₂O