Experiment 3-Extraction of Caffeine

Experiment 3-Extraction of Caffeine - Daya Devanathan Nolan...

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Daya Devanathan Nolan Graves 9/24/10 Experiment:12A
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Abstract: In this experiment, 20 ml water was placed in a 50-mL beaker and the beaker was covered with a watch glass and heated to boiling. A preweighed tea bag was weighed and then placed into the hot water and heated for about 15 min. Additional amounts of water were pipetted into the beaker to replace the evaporated water. Equal volumes of the concentrated tea solution was then transferred to two separate centrifuge tubes, about 0.5 g sodium carbonate was added to each, the tubes were capped and shaken until all the solid dissolved and then cooled to room temperature. Then 3 ml methylene chloride was pipette into each of the tubes, capped, shaken, vented, shaken again, and then centrifuged for several minutes. The lower organic layer was then removed and transferred to a 25-mL Erlenmeyer. Then 3 mL methylene chloride was added to the remaining aqueous layer in each tube, capped, shaken, and centrifuged for several minutes. The organic layers from each extraction were combined into the flask containing the first extraction. The organic layer was then dried and the mixture was allowed to stand for about 10 minutes with occasional stirring. The
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Experiment 3-Extraction of Caffeine - Daya Devanathan Nolan...

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