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Asprin Experiment On Blackboard Essay

1094 words - 5 pages

Aspirin was prepared according to the protocol provided on Blackboard. The three sections to this experiment were 1. Synthesis of Aspirin, 2. Recrystallization of Aspirin, and 3. Characterization of Aspirin.
In the first section, the Synthesis of Aspirin, salicylic acid was weight to be 3.029 grams using mass by difference since it was weighed on a 150 milliliter beaker. 9.23 milliliters of the acetic anhydride and 14 drops of 85 percent phosphoric acid were added to this beaker. A Bunsen burner provided by the laboratory was then used to boil the just mixed combination by producing a flame underneath the positioned beaker on top, and then allowed to cool for several minutes after the Bunsen burner flame was terminated. Two quantities of distilled water were then added to this mixture to make it cool even further, which were 41 drops and 30 milliliters. After cooling for some time, this beaker was placed into an ice bath in order to start the crystallization process. A glass rod was used to scratch around the bottom and the sides to catch all of the crystallized Aspirin that was being formed during this whole process. Then, by using a Buchner funnel and filter paper, which was placed on top of the flask connected to a water aspirator with rubber tubing, the excess liquid was removed from the just scraped Aspirin crystals when the Aspirin was placed on the filter paper. Using a medicine dropper, the Aspirin crystals on the filter paper were washed with distilled water just so that any non-pure substances were removed from the crude product. When these crystals were then ultimately dry, they were placed on a watch glass and put into an oven for 30 minutes. Then they were weighed by mass by difference to yield 2.4667 grams of crude synthesized Aspirin.
In the second section, the Recrystallization of Aspirin, 0.54785 grams of the crude Aspirin was weighed on a 150 milliliter beaker with mass by difference. 20 milliliters of distilled water was added to the beaker and then all the contents from that beaker were poured onto a filter paper on a Buchner funnel. This was done to remove the aqueous layer and to collect the solid. The crystals were taken from there and put into a 150 milliliter beaker on which 45 milliliters of saturated bicarbonate was added to and stirred. These contents were again transferred on to the filtration flask once the 125 milliliter size flask was being used and the aspirator was turned on. Then, a 100 milliliter beaker, 20 milliliters of 6M of HCl was obtained and very carefully transferred to the previous solution with the saturated bicarbonate. These items were filtered in the filter flask and a rubber policeman covered by a filter paper was used to squeeze out any excess liquids remaining from the solid. Then in a 100 milliliter beaker, the solid was transferred into it in addition to 4 milliliters of 100% ethanol which its purpose was to dissolve this solid. For 3 minutes once again, the dry Aspirin was placed into an...

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