Al2O3+3H2SO4===Al2(SO4)3+3H2O
Al2O3+6H+=2Al3++3H2O
Al2O3+2NaOH===2NaAlO2+H2O(Al2O3两性氧化物)
Al2O3+2OH―=2AlO2―+H2O

3HCl+Al(OH)3==AlCl3+3H2O
3H++Al(OH)3=Al3++3H2O
NaOH+Al(OH)3==NaAlO2+2H2O
OH–+Al(OH)3=AlO2–+2H2O