Question
Write two reactions to explain amphoteric nature of water.
✓
Answer
A substance is termed amphoteric if it can show both, the acidic and basic behaviour Water is an amphoteric substance. It has the ability to act as an add as well as a base. With $\text{NH}_3$ (which is a base) it acts as an add.
$\text{NH}_3(\text{aq})+\text{H}_2\text{O}(\text{l})\rightleftharpoons\text{NH}^+_4(\text{aq})+\text{OH}^-(\text{aq)}$
It acts as a base with $\text{H}_2\text{S}$ which is a Bronsted acid.
$\text{H}_2\text{S}(\text{aq})+\text{H}_2\text{O}(\text{l})\rightleftharpoons\text{H}_3\text{O}+(\text{aq})+\text{HS}^-(\text{aq})$
$\text{NH}_3(\text{aq})+\text{H}_2\text{O}(\text{l})\rightleftharpoons\text{NH}^+_4(\text{aq})+\text{OH}^-(\text{aq)}$
It acts as a base with $\text{H}_2\text{S}$ which is a Bronsted acid.
$\text{H}_2\text{S}(\text{aq})+\text{H}_2\text{O}(\text{l})\rightleftharpoons\text{H}_3\text{O}+(\text{aq})+\text{HS}^-(\text{aq})$
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