Cl2-hcl-alcl3-al(oh)3-al2(so4)3
Cl₂ + H₂ = 2HCl 6HCl + 2Al = 2AlCl₃ + 3H₂ AlCl₃ + 3KOH = Al(OH)₃ + 3KCl 2Al(OH)₃ + 3H₂SO₄ = Al₂(SO₄)₃+ 6H₂O