Question

Prove that water is amphoteric specie.

Answer 1

Answer. A substance that can behave as an acid as well as a base is called amphoteric specie. For example, H2O behaves as amphoteric specie. According to Bronsted Lowry concept H2O behaves as a base because it accepts a proton (H+) when it reacts with HC1.

            HCl(aq) + H2O (l)      H3O+(aq) + CI-(aq)

On the other hand, H2O behaves as an acid because it donates a proton (H+) when it reacts with NH3     
         H2O(1) + NH3(aq)         NH4+(aq) + OH-(aq)

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