Question

Why does al2o3 reacts with both acid and base with chemical equation?

Answer 1

al2O3 which is aluminum oxide is an amphoteric oxide which has acidic and basic behavior. It reacts as acid with base to form salt and reacts as basic with an acid to form salt.

Answer 2

al203 is an aphotric oxide.
shows acidic and basic property:APHOTRIC OXIDES.
thus al203 react with:
AL203 +6HCL=2ALCL3 +3H20
here it's an acidic oxide
AL2O3+2NAOH=2NAALO2 +H20
here it's basic oxide