Aspirin Essay

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Recommended: Purification And Calculation Of Aspirin

Introduction Aspirin is an organic compound created through the process of esterification. In this reaction, an ester is formed from an alcohol and a carboxylic acid combined with an acid catalyst (Timberlake). Aspirin, or acetylsalicylic acid, is made from the reaction of salicylic acid and acetic anhydride, with a byproduct of acetic acid also. Various techniques have historically been used to produce aspirin. Filtration is the process of removing any excess water from the crystals by vacuuming or suctioning it out. Recrystallization is the cooling and hardening of the crystals to give a purified product by using a solvent to pull out any impurities. To calculate the theoretical yield of a product, the mass of the acid is multiplied by the …show more content…

After crystallization, the product was a white solid. After recrystallization, it was very lumpy, but there were distinct white chunks present. This product changed several times in appearance because of the purification of it. The material was left with no impurities so the product kept getting more solid and distinct chunks. The percent yield is calculated by taking the weight of the aspirin after recrystallization divided by the theoretical yield and multiplying it by 100. The yield before and after recrystallization was a significant difference. Before recrystallization, the product weighed 8.9 grams because there was several impurities present in the product, with the percent yield being 135%. The product weighed so much more than expected as a result of excess impurities that had not been filtered out yet. After the product was recrystallized, however, and the product was purified, it weighed 1.14 grams, with the percent yield being 17.3%. The percent yield after the final recrystallization was so far below 100% as a result of the first step not fully working where the solution did not dissolve completely. This caused the following steps to also have problems and the yield was so low as a result. The weight of the final product was expected to go down after recrystallization because any excess water and other impurities were being taken out. There may have been some loss of the product when it was being filtered because some was still left in the container for

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