化學一問題（aluminium)！

The term "amphoteric oxide" means that the oxide has both acidic properties and basic properties. In other words, the oxide can neutralize (dissolve in) both dilute strong acids and dilute strong alkalis.

Aluminium oxide is amphoteric, because it can neutralize (dissolve in) both dilute strong acids and dilute strong alkalis. The equations are:
Al2O3(s) + 6H+(aq) → 2Al3+(aq) + 3H2O(l)
Al2O3(aq) + 3H2O(l) + 2OH-(aq) → 2[Al(OH)4]-(aq)
=