4_Smith_William - The percent yield was considerably low....

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William (Jake) Smith Chem 111 016 Fariba Karimi Kasey Rocazella 10-17-11 Aspirin Synthesis The chemical acetylsalicylic acid is better known as aspirin. Acetic anhydride in the presence of phosphoric acid and salicycylic acid react together to synthesize aspirin. In the chemical reaction, the catalyst is phosphoric acid. The resulting chemical equation is (CH 3 CO) 2 O + HOC 6 H 4 COOH -> CH 3 CO 2 C 6 H 4 CO 2 H In the experiment 3.0001 ml of acetic anhydride combined with 2.0024 grams of salicylic acid. The acetic anhydride produced 5.7309 grams of aspirin. Salicylic acid synthesized 2.6117 grams of aspirin. Since the salicylic acid synthesized the lesser amount it is the limiting reagent. The percent yield was then found by dividing the actual yield of aspirin formed (1.3445) by the theoretical yield (2.6117). The percent yield was found to be 51.48 %.
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Unformatted text preview: The percent yield was considerably low. This was on the account that aspirin was lost through the filter paper during the vacuum filtration. That mad the percent yield lower. There was also aspirin lost when it was taken from the filter paper and scraped into the 100 ml beaker, which made the percent yield lower as well. Another factor that could have influenced the loss of aspirin would be the possibility of too much ethanol being added to the solution, because it would upset the ratio and produce less aspirin. The final potential aspirin loss factor would be the changes of water temperature the solution was exposed to, which could have cause some to evaporate....
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