sdkfj - Isolation and Purification of Caffeine I. Purpose...

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Isolation and Purification of Caffeine I. Purpose and Objective The purpose of this lab was to use extraction and sublimation techniques to isolate and purify caffeine from tea. II. Introduction In this lab, we separated caffeine from tea. Caffeine is water soluble, so by adding the tea bags to the hot water we obtained, the caffeine was extracted from the tea. However, tannins, which is another organic compound found in tea, is also water- soluble and came out with the caffeine. We needed to separate the two substances. By adding sodium carbonate to the solution, the acidic tannins bind to the basic sodium carbonate and it remains in the aqueous solution. It is then possible for the caffeine to be extracted using methylene chloride. Through sublimation we can then obtain the purified caffeine. III. Procedure, Data, and Observations 1. Carefully open a tea bag and empty the contents. Weigh out 1.0 g of tealeaves and place them back in the empty bag. Close and secure the bag with staples. 2.
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This note was uploaded on 04/16/2008 for the course CHEM 114 taught by Professor Gurney during the Spring '08 term at Simmons.

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sdkfj - Isolation and Purification of Caffeine I. Purpose...

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