2Al+3H2SO4=Al2(SO4)3+3H2 Al2(SO4)3+3NaOH=2Al(OH)3+3Na2SO4 2Al(OH)3 (t)=Al2O3+3H20 Al2O3+6HCl=2AlCl3+3H2O Al(OH)3+KOH=K[Al(OH)4]