Aspirin was prepared according to the protocol provided on Blackboard. The three sections of this experiment were 1. Synthesis of Aspirin, 2. Recrystallization of Aspirin, and 3. Characterization of Aspirin. In the first section, the synthesis of aspirin, the weight of salicylic acid was 3.029 grams using mass by difference as it was weighed into a 150 ml beaker. To this beaker were added 9.23 ml of acetic anhydride and 14 drops of 85% phosphoric acid. A Bunsen burner provided by the laboratory was then used to boil the newly mixed combination producing a flame under the high-placed beaker, and then allowed to cool for several minutes after the Bunsen burner flame had gone out. Two quantities of distilled water were then added to this mixture to cool it further, which were 41 drops and 30 milliliters. After cooling for some time, this glass was placed in an ice bath to start the crystallization process. A glass rod was used to scrape the bottom and sides to capture all the crystallized aspirin that was forming during the entire process. Then, using a Buchner funnel and filter paper, which was placed over the flask connected to a water aspirator with a rubber hose, the excess liquid was removed from the freshly scraped Aspirin crystals when the Aspirin was placed on the filter paper. Using a dropper, the aspirin crystals on the filter paper were washed with distilled water just to remove any non-pure substances from the raw product. When these crystals were finally dry, they were placed on a watch glass and placed in the oven for 30 minutes. They were then weighed by mass by difference to obtain 2.4667 grams of raw s...... half of the paper ......s the temperature variation of both these batches, 6°C for the pure, and 13°C for the raw. In this final subsection of Aspirin Characterization the absorbance values ​​were recorded. Initially, 0.0566 grams and 0.0590 grams of pure and crude aspirin respectively were obtained and each was individually placed in beakers (400 milliliters) and 250.0 milliliters of distilled water was added to them. From each beaker a small amount of the newly dissolved solutions was transferred into a cuvette, one cuvette for each type of aspirin. Each cuvette was inserted into the ultraviolent spectroscopy mechanism connected to a computer and the absorbance spectrum values ​​were obtained at 298 nm (Figure 5) (0.1987 pure aspirin and 0.9549 crude aspirin). Overall, these three methods led to the determination of the percentage purity for each type of aspirin.