1. Preparation and Recrystallisation of Aspirin
... an ester (RCOOR) and water. 3. Theory Aspirin is a derivative of salicylic acid. The structural formula of salicylic acid is: Salicylic acid contains both a carboxylic group and a hydroxyl group bonded to the benzene ring. When a carboxylic acid such as salicylic acid reacts with an alcohol (or a phenol) in the presence of a strong acid, an ester is formed. The catalyst is usually concentrated sulfuric acid. Dry hydrogen chloride gas is used in some cases, but these tend ... solution of acetic anhydride and concentrated sulfuric acid, it did not completely dissolve into the solution, ev...
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