Amino acids are acids on one hand, and a base on the other hand.
An acid is a substance that produces hydrogen or hydroxonium ions as the only positively charged ion when it ionizes.
All amino acids have an amine group -[tex]NH_2[/tex] and a carboxylic group -[tex]COOH[/tex].
The carboxylic group ionizes such that:
[tex]COOH -- > COO^- + H^+[/tex]
The presence of the amine group enables amino acids to also act as a base.
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