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Question 24

Write chemical reactions to show the amphoteric nature of water.

Answer

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) accepts a proton from H2S(aq). 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 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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