AL=AL2O3=AL2(SO4)3=ALOH3=AL2O3=AL
4Al+3O2=2Al2O3 Al2O3+3H2SO4=Al2(SO4)3+3H2O Al2(SO4)3+6KOH=3K2SO4+2Al(OH)3 2Al(OH)3+3CaO=Al2O3+3Ca(OH)2 Al2O3+6Na=3Na2O+2Al