CHEM 2313 Lecture Notes - Acetic Anhydride, Sodium Acetate, Ligroin
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17 Feb 2014
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The goal of this experiment is to synthesize acetylsalicylic acid (aspirin). One gram of salicylic acid was placed in two test tubes and two milliliters of acetic anhydride was then added to each tube. Two-tenths of a gram of sodium acetate was added to one of the tubes. Five drops of concentrated sulfuric acid was added to the other tube. The solids in the tubes were dissolved by placing the test tubes in a hot water bath. Both tubes were then poured into a single beaker and mixed. The mixture was the cooled to form crystals and filtered using vacuum filtration. The resulting crystals were then dissolved in water, with ligroin added and placed in an ice bath. After crystals formed, vacuum filtration was used to separate the crystals. The reaction with sulfuric acid is a faster reaction. As soon as the sulfuric acid is added, the test tube warmed up and after some time, turned a yellowish color.
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