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Question
Write chemical reactions to show the amphoteric nature of water.
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Solution
The amphoteric nature of water can be described on the basis of the following reactions:
- Reaction with H2S-
The reaction takes place as:
\[\ce{\underset{Base}{H2O_{(l)}} + \underset{Acid}{H2S_{(aq)}} <=> \underset{Conjugate acid}{H3O^+_{(aq)}} + \underset{Conjugate base}{HS^-_{(aq)}}}\]
In the forward reaction, \[\ce{H_2O_{(l)}}\] accepts a proton from \[\ce{H_2S_{(aq)}}\]. Hence, it acts as a Lewis base. - Reaction with NH3-
The reaction takes place as:
In the forward reaction, `H_2O` denotes its proton to`NH_(3(aq))`. Hence, it acts as a Lewis acid. - Self-ionization of water-
In the reaction, two water molecules react as:
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