14.24 How do you explain the amphoteric behaviour of amino acids?

14.24 

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

In zwitter ionic form, the amino acid show amphoteric behaviour as they react with both acids and bases. In the acidic medium, COO^- ion of the zwitter-ion accepts a proton to form the cation first, while in the basic medium, ⁺NH₃ ion loses a proton to form the anion, as shown below:-

Thus, amino acids show amphoteric behaviour.

<p><strong>14.24&nbsp;</strong></p><p>Amino acids contain an acidic (carboxyl group) and a basic (amino) group within the same molecule. In aqueous solution, they neutralize each other. The carboxyl group loses a proton while the amino group accepts it. S a result, a dipolar or zwitter-ion is formed.</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1686816819phpyhMpKA_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1686816819phpyhMpKA.jpeg" alt="" width="223" height="82"></picture></div></div><p>In zwitter ionic form, the amino acid show amphoteric behaviour as they react with both acids and bases. In the acidic medium, COO^- ion of the zwitter-ion accepts a proton to form the cation first, while in the basic medium, ⁺NH₃ ion loses a proton to form the anion, as shown below:-</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1686816845phplBjd2B_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1686816845phplBjd2B.jpeg" alt="" width="311" height="61"></picture></div><div>Thus, amino acids show amphoteric behaviour.</div></div>

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