The amphoteric nature of water can be described on the basis of the following reactions:
(1) Reaction with H2S The reaction takes place as:
In the forward reaction, H2O(l) Hence, it acts
as a Lewis base
(2) Reaction with NH3
The reaction takes place as:
In the forward reaction H2O(l) denotes its proton to NH3(aq) . Hence, it acts as a Lewis acid.
(3) Self-ionization of water
In the reaction, two water molecules react as:
