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The common ion effect refers to the suppression of ionization of a weak electrolyte when a strong electrolyte containing a common ion is added to its solution. This effect can be explained on the basis of the law of mass action and Le Chatelier’s principle, which states that when a system at equilibrium is disturbed, it adjusts itself to counteract the disturbance. Consider a weak acid such as acetic acid (CH₃COOH) in aqueous solution. ___ ______ ______ ________ ______ ___.
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