Write chemical reactions to show the amphoteric nature of water

Asked by Abhisek | 1 year ago |  37

##### 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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