Acidic buffer


Let an acidic solution be prepared by acetic acid to sodium acetate solution.

Acetic acid is a weak acid and sodium acetate is highly ionised.

The ionisamon of acetic acid is further suppressed due to the concentration of CH_3COO^- ions obtained from CH_3COONA.

CH_3COONa \leftrightharpoons CH_3COO^- + Na^+

 

CH_3 COOH \leftrightharpoons \underset{common ion}{CH_3} CO O^- + H^+

 

Now, when a few drops of decinormal HCI are added to it, its H^+ ions combine with CH_3COO^- ions present in solution and form feebly ionised CH_3COOH, with the result, all theH^+ ions are consumed and no appreciable change in H^+ ion concentration occurs. Hence pH value remains constant.

acidic buffer

Acidic buffer




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