First slide

Common ion effect

Question

Acetic acid dissociates as CH₃COOH $\large \rightleftharpoons$ CH₃COO^– + H⁺. If a little amount of sodium acetate is added to its aqueous solution

Easy

A

The acid dissociates further
B

The H⁺ ion concentration increases
C

The acid dissociation is suppressed
D

The equilibrium is unaffected

Solution

CH₃COOH $\large \rightleftharpoons$ CH₃COO^– + H⁺
CH₃COONa is added, CH₃COONa is a strong electrolyte. It exists in ionized form. Thus addition of CH₃COONa increases [CH₃COO^-]. Addition of products favour backward reaction. Thus dissociation of CH₃COOH is supressed.

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