It will force the equilibrium to the left meaning that less of the acid will dissociate.
CH3COOH ==> CH3COO^- + H^+
If I add acetate ion (say from sodium acetate) or H^+ (say from HCl), Le Chatelie's Principle takes over and the reaction shifts to the left. That means the acid is less dissociated.
What would happen to a weak base dissociation equilibrium if more products were added?
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