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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 ⇌ C6H5COO^- + H^+ The pKa of this reaction is 4.2. In a 0.65 M solution of benzoic acid, what percentage of the molecules are ionized? Express the percentage numerically using two significant figures.