①2Al＋6HCl=2AlCl3＋3H2↑ ②4Al＋3O2 =(点燃）2Al2O3
2Al＋6H＋=2Al3＋＋3H2↑
③2Al＋2NaOH＋2H2O=2NaAlO2＋3H2↑ ④Al2O3＋6HCl=2AlCl3＋3H2O
2Al＋2OH－＋2H2O=2AlO2－＋3H2↑ Al2O3＋6H＋=2Al3＋＋3H2O
⑤Al2O3＋2NaOH=2NaAlO2＋H2O ⑥AlCl3＋3NH3•H2O=Al(OH)3↓＋3NH4Cl
Al2O3＋2OH－=2AlO2－＋H2O Al3＋＋3NH3•H2O = Al(OH)3↓＋3NH4＋
⑦Al(OH)3＋3HCl=AlCl3＋3H2O ⑧2Al(OH)3 =（加热）Al2O3＋3H2O
Al(OH)3＋3H＋=Al3＋＋3H2O
⑨NaAlO2＋HCl＋H2O =Al(OH)3↓＋NaCl或NaAlO2＋2H2O＋CO2=Al(OH)3↓＋NaHCO3
AlO2－＋H＋＋H2O=Al(OH)3↓ AlO2－＋2H2O＋CO2=Al(OH)3↓＋HCO3－
⑩Al(OH)3＋NaOH = NaAlO2＋2H2O ⑾Al3＋＋3H2O =Al(OH)3胶体＋3H＋
Al(OH)3＋OH－= AlO2－＋2H2O
⑿AlCl3＋4NaOH = NaAlO2＋3NaCl＋2H2O Al3＋＋4OH－= AlO2－＋2H2O