2Al+6H2O=2Al(OH)3+3H2 2Al(OH)3+2NaOH=2NaAlO2+4H2O 总反应为:2Al+2NaOH+2H2O=2NaAlO2+3H2 离子反应:2Al+2OH- +2H2O=2AlO2- + 3H2