Al - AlCl3 - Al(OH)3 - Al2(SO4)3 BaSO4

2Al + 3H₂SO₄ = Al₂(SO₄)₃ + 3H₂ Al₂(SO₄)₃ + 6KOH = 2Al(OH)₃ + 3K₂SO₄2Al(OH)₃ + 3H₂SO₄ = Al₂(SO₄)₃ + 6H₂OAl₂(SO₄)₃  + 3Ba(NO₃)₂ = 3BaSO₄ + 2Al(NO₃)₃