Write chemical reactions to show the amphoteric nature of water.

Question:

Write chemical reactions to show the amphoteric nature of water.

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, $\mathrm{H}_{2} \mathrm{O}_{(i)}$ accepts a proton from $\mathrm{H}_{2} \mathrm{~S}_{(a q)}$. Hence, it acts as a Lewis base.

2) Reaction with NH3

The reaction takes place as:

In the forward reaction, $\mathrm{H}_{2} \mathrm{O}_{(t)}$ denotes its proton to $\mathrm{NH}_{3((q))}$. Hence, it acts as a Lewis acid.

3) Self-ionization of water

In the reaction, two water molecules react as:

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