Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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How Do You Explain the Amphoteric Behaviour of Amino Acids? - Chemistry

How do you explain the amphoteric behaviour of amino acids?

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Solution 1

In aqueous solution, the carboxyl group of an amino acid can lose a proton and the amino group can accept a proton to give a dipolar ion known as zwitter ion.

Therefore, in zwitter ionic form, the amino acid can act both as an acid and as a base.

Thus, amino acids show amphoteric behaviour.

Solution 2

Amino acids contain an acidic (carboxyl group) and basic (amino group) group in the same molecule. In aqueous solution, they neutralize each other. The carboxyl group loses a proton while the amino group accepts it. As a result, a dipolar or zwitter ion is formed.

In zwitter ionjc form, a-amino acid show amphoteric behaviour as they react with both acids and bases.

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NCERT Class 12 Chemistry Textbook
Chapter 14 Biomolecules
Q 16 | Page 423
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