Chicago
...e Erlenmeyer flask and a vacuum filtration system was developed. By using filter paper the aspirin will be unable to go through and will be captured. The filtration process must be run more than once to provide best results. The time for air-drying the sample may need to be left alone until the next lab period. In the preparation of aspirin, the mass of salicylic acid used was approximately 2.00 grams, as the procedure requested. The theoretical yield of aspirin was calculated from the reaction’s stoichiometry. The salicylic acid was placed into a 125-mL Erlenmeyer flask and 5-mL of acetic anhydride was added and swirled. About 5 drops of sulfuric acid were added to the solution. The solution was heated and 10-mL of deionized water was added. We placed the flask into a ice bath. Crystals finally formed after a heavy 25-30 minutes. The crystals went into a filtration process, taking out as much water as possible. The filtration went on until the water that was separated from the aspirin was clear and free of any particles that could be part of the aspirin. The filter paper was then taken out and placed onto a watch glass and stored into a cabinet. A week of drying and the aspirin was weighed. The experimental yield of aspirin came about to be 1.964 grams. The filter paper had already been taken into consideration. Data: Table 1: Experimental Data and Yields Salicylic Acid Obtained (g) 2.0 Theoretical Yield of Aspirin (g) 2.609 Actual Yield of Aspirin (g) 1.964 Percent Yield (%) 75.28 Theoretical yield = 2.0 g salicylic acid x 1 mol acid x 138.1 g aspirin 138.1 g acid 1 mol aspirin = 2.609 g of aspirin Percent Yield = (actual yield / theoretical yield) x 100 = (1.964 g / 2.609 g) x 100 = 75.28 % Conclusion: The aspirin was prepared properly, but the data...