Write chemical reactions to show the amphoteric nature of water.

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Solution

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, accepts a proton from. Hence, it acts as a Lewis base.

2) Reaction with NH₃

The reaction takes place as:

In the forward reaction, denotes its proton to. Hence, it acts as a Lewis acid.

3) Self-ionization of water

In the reaction, two water molecules react as:

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