Al2O3 is an amphoteric oxide,Explain with chemical reactions.
Answers
Answer:
Aluminium oxide is amphoteric. It has reactions as both a base and an acid. Reaction with water: Aluminum oxide is insoluble in water and does not react like sodium oxide and magnesium oxide. The oxide ions are held too strongly in the solid lattice to react with the water.
An amphoteric compound is a molecule or ion that can react both as an acid and as a base.
Many metals form amphoteric oxides or hydroxides.
Amphoterism depends on the oxidation states of the oxide.
in case of aluminum oxide:-
Aluminium oxide reacts with both acidic and basic substances to give neutralization reaction and hence cannot be called a true acid as well as base. Hence it is called amphoteric oxide.
Al2O3 + 6HCl → 2AlCl3 + 3H2O
Neutralisation Reaction with hydrochloric acid ( behaves like a base )
Al2O3+ 2NaOH → 2NaAlO2 + H 2O
Neutralisation reaction with Sodium hydroxide ( behave like an acid )