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Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene

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Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid dissociates in water: C6H5COOH(aq)+H2O(l)C6H5COO(aq)+H3O+(aq) The pKa of this reaction is 4.2. In a 0.54molL1 solution of benzoic acid, what percentage of the molecules are ionized? Express your answer to two significant figures and include the appropriate units

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