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Synthesis of aspirin in laboratory is achieved by acetylation reaction of salicylic acid with acetic anhydride. The reaction is accelerated using phosphoric acid as a catalyst. The reaction mixture was heated at 85ºC for 10-20 minutes and cooled thereafter. The product was isolated by quenching the reaction with addition of water which allows precipitating the crude due to less solubility. Also addition of water removes the excess of acetic anhydride by hydrolyzing it into acetic acid. The precipitate was filtered and, crude of aspirin was purified by crystallization using ethanol as a solvent. The melting point was found 138 ºC for the dried pure aspirin....
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