Ncert Exercises & Solutions

9.24 Write chemical reactions to show the amphoteric nature of water.

The amphoteric nature of water can be described on the basis of the following reactions:

1) Reaction with $H_{2} S$ The reaction takes place as:
$H_{2} O_{(I)} + H_{2} S_{(a q)} ⇌ H_{3} {O^{+}}_{(a q)} + H {S^{-}}_{(a q)} a c c e p t s a p r o t o n f r o m H_{2} S_{(a q)}$
$B a s e A c i d C o n j u g a t e C o n j u g a t e$
$A c i d B a s e$

In the forward reaction, $H_{2} O_{(I)}$ Hence, it acts as a Lewis base.

2) Reaction with $N H_{3}$
The reaction takes place as:

In the forward reaction, $H_{2} O_{(I)}$ denotes its proton to $N H_{3 (a q)}$ . Hence, it acts as a Lewis acid.

3) Self-ionization of water
In the reaction, two water molecules react as:

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