Al-Al2(SO4)2-Al(OH)3-NaAlO2

2Al + 3H₂SO₄(р-р)=Al₂(SO₄)₃ + 3H₂↑ Al₂(SO₄)₃ + 6KOH = 3K₂SO₄ + 2Al(OH)₃↓ Al(OH)₃↓+NaOH =(сплавление)= NaAlO₂ + 2H₂O

Al + H2SO4 = Al2(SO4)3 + H2 Al2(SO4)3 + H2O = Al(OH)3 + H2SO4 Al(OH)3 + NaOH = Na3AlO3 + H2O