Write chemical reactions to show the amphoteric nature of water

Asked by Abhisek | 1 year ago |  37

1 Answer

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:

\( H_{2}O_{(l)}+H_{2}S_{(aq)}\rightleftharpoons H_{3}O^{+}_{(aq)}+HS^{-}_{(aq)} \)

In the forward reaction, 

\( H_{2}O_{(l)}​ \) accepts a proton from \( H_{2}S_{(aq)}\)

 Therefore, it acts as a lewis base.

 

(2) Reaction with NH3

The reaction takes place as:

\( H_{2}O_{(l)}+NH_{3(aq)}\rightleftharpoons OH^{-}_{(aq)}+NH^{+}_{4(aq)}\)

In the forward reaction, \( H_{2}O_{(l)}\) denotes its proton to \( NH_{3(aq)}\)​. 

Therefore, it acts as lewis acid.

 

(3) Self-ionization of water

2 water molecules reacts in this reaction as,

\( H_{2}O_{(l)}+H_{2}O_{(l)}\rightleftharpoons H_{3}O^{+}_{(aq)}+OH^{-}_{(aq)}\)

Answered by Pragya Singh | 1 year ago

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