Write chemical reactions to show the atmospheric nature of water.

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Solution

The atmospheric nature of water can be described on the basis of the following reactions:
(1) Reaction with $H_{2} S$ The reaction takes place as:
$H_{2} O_{(l)} B a s e + H_{2} S_{(a q)} A c i d ⇌ H_{3} O_{(a q)}^{+} C o n j u g a t e a c i d + H S_{(a q)}^{-} C o n j u g a t e b a s e$
In the forward reaction, $H_{2} O_{(l)}$ accepts a proton from $H_{2} S_{(a q)}$ . Hence, it acts as a Brønsted-Lowry base.

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

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

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

In the forward reaction, $H_{2} O_{(l)}$ denotes its proton to $H_{2} O_{(l)}$ . Hence, it acts as an amphoteric solution.

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