Another source of error could have been due to the transport of the aspirin from the Erlenmeyer flask after cooling to the funnel to be filtered. Mixed the solution and placed the Erlenmeyer flask in the water bath for about 10 minutes, making sure the Erlenmeyer flask did not tip in the water bath. custom paper from our expert writers, Synthesis of Aspirin. The ethanol was a clear solution with an odour similar to strong alcohol. Other than being used in the production of aspirin, acetic anhydride is used to convert cellulose to cellulose acetate, a key component in photographic film and other coated materials (Wikipedia, Acetic anhydride, 2013). 3% Salicylic acid is toxic in large quantities but in small doses can be useful for food preservatives and as an antiseptic. 8. on. - J. Smith, et. Be sure to use a water bath that is large enough for any bubbles which form in the water to easily pass around the Erlenmeyer flask you are heating. Diphenylacetylene It has become very common as an antiplatelet to prevent blood clot formation and is used to prevent heart attacks and strokes. As for what else could be in the test tube, either unreacted reagents (salicylic acid? Aspirin Synthesis - Lab Report Questions: 1. It has been present for over one hundred years and is one of the most widely used medications in the world. A filter crucible and mortar and pestle were obtained from the instructor. 1. The idea of recrystallization is to purify your product. I don't know how you made your aspirin), side products or impurities that were present in your reagents. Weighed the piece of filter paper with the aspirin on it. This comes from his winnings against their past opponents giving support on. 204g STUDY. Vidallon, Mark Louis P. Date Performed: February 20, 2012 CHEM44. 7. The reaction between acid and soap is violent and may destroy clothing. In this reaction, the –OH on the salicylic acid acts as the alcohol and the acetic anhydride acts like a carboxylic acid. Add about 10 mL of ice-cold deionized water to the flask and cool in an ice bath until crystallization appears to be complete. A way to get rid of the source of error would be to keep the samples in a more isolated area where there is a smaller chance of contamination. Remember. Using a clean, dry 150 mL beaker, dissolve the aspirin in about 1mL of 95% ethyl alcohol, and warm the mixture slightly by placing it in the hot water bath. After the limiting reactant was determined, the theoretical yield of aspirin was calculated at approximately 1.97g. 1.51g C7H6O3 x 1 mole C7H6O3 x 1 mole C9H8O4 x 180.154 g C9H8O4 138.118 g C7H6O3 1 mol C7H6O31 mol C9H8O4 Acetic anhydride and salicylic acid are mixed together, and then acidified by the addition of a few drops of concentrated sulfuric acid, which catalyzed the reaction. sulfuric acid. After all of the water was filtered through, left the filter paper to dry until the next class. For example, Tony Parker is a good person with a good heart wherein he helps those needy people. ; Heat the flask gently on the steam bath for at least 10 minutes. Gas building in a sealed container is the primary cause of laboratory explosions and heating the beaker to high or not providing sufficient space around the Erlenmeyer flask may produce an explosion. The purity of the sample will be qualitatively determined with melting point analysis. Still have questions? The main objective of the synthesis of aspirin lab was so produce aspirin (acetylsalicylic acid) through the reaction of salicylic acid and acetic anhydride. Recorded the weight on the data sheet. Limiting reactants are important in chemical reactions because a reaction cannot proceed without all of the reactants. Let Professional Writer Help You, 6000 Fairview Road, SouthPark Towers, Suite 1200, Charlotte, NC 28210, USA. (Hint: remember that this procedure occurred under the heading, Purification. Filter the crystals by vacuum filtration. The percent yield is calculated to determine the effectiveness of the reaction in preparing the desired product (aspirin). 1.600g of aspirin was obtained after the second synthesis. PhDessay is an educational resource where over 1,000,000 free essays are collected. In the fume hood, add approximately 3.5 - 4.0 mL of acetic anhydride to the flask containing the salicylic acid and stopper it. Dispose the filtrate it the appropriate waste container. a. Polar Purify the rest of the aspirin by recrystallization. Clamp the stoppered Erlenmeyer flask to a ring stand to hold it in the 70-80˚ C water bath. Weigh it again. 2. Don’t miss a chance to chat with experts. = 1.969566168g Aspirin. Were the new crystals the same substance as the old ones? D. Slap? (Show your work). S Oil Dependence and how it could be fixed and changed for the best interest of the. Swirled the beaker to dissolve as much of the solid as possible, then placed the beaker on the hot plate until the solid completely dissolved.

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