MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumDissociation of Weak Acids and Bases

The following equilibrium exists in aqueous solution, CH3COOH CH3COO – + H + if dil. HCl is added, without change in temperature, the

A.Concentration of CH3COO

B.Concentration of CH3COO✓ Correct

C.The equilibrium constant will increase

D.The equilibrium constant will decrease

Explanation

3 CH COOH is a weak acid, in the presence of HCl (strong acid) its dissociation is suppressed (common ion effect). This causes 3 CH COO ions to associate with H thus decreasing the acetate ion’s concentration in solution according to Le Chatelier’s principle.

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