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Write chemical reactions to show the amphoteric nature of water. 

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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: 

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