Aspirin is a monoprotic acid called acetylsalicylic acid., Ask an Expert

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Aspirin is a monoprotic acid called acetylsalicylic acid. Its formula is HC9H7O4. A certain pain reliever was analyzed for aspirin by dissolving 0.431 g of it in water and titrating it with 0.0430 M KOH solution. The titration required 26.12 mL of base. What is the percentage by weight of aspirin in the drug?

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