1) 1. 2Al + 6H₂O = 2Al(OH)₃ + 3H₂
2. Al(OH)₃ + 3HCl = AlCl₃ + 3H₂O
3. AlCl₃ + 3NaOH = Al(OH)₃ + 3NaCl
4. Al(OH)₃ + NaOH = Na[Al(OH)₄]
2) 1. 4Al + 3O₂ = 2Al₂O₃
2. Al₂O₃ + 2NaOH + H₂O = 2Na[Al(OH)₄]
3. Na[Al(OH)₄] = Al(OH)₃ + NaOH
4. 2Al(OH)₃ 
Al₂O₃ + 3H₂O
5. 2Al₂O₃ 4Al + 3O₂