Chem227_LabReport

Chem227_LabReport - Analysis of Analgesics Chemistry 227...

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Analysis of Analgesics Chemistry 227 Lab Section 17 Instructor: Susan He October 31, 2007 Abstract This paper describes the identification of certain compounds in common household analgesics. Three household painkillers and samples of aspirin, acetominophen, ibuprofen, caffeine, salicylamide, or pyrilamine were compared using thin-layer chromatography. After viewing the results under UV light and measuring the distance each compound traveled, the Rf values of the known compounds and the unknowns were compared. One could conclude that Goody’s was found to have aspirin, acetaminophen, and caffeine; Midol to have acetaminophen, caffeine, and pyrilamine; and Bayer to have aspirin and caffeine. A different method of comparing small compounds will be used called paper chromatography. In this experiment, paper chromatography was used to separate components of various food dyes to determine if green food dye was simply a mixture of blue and yellow. After performing the experiment and carefully examining the results, it was determined that green dye is not a mixture of blue and yellow but consists of different compounds entirely.
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Introduction Chromatography is a purification technique that works by separating the components of a mixture. The two main types of chromatography are adsorption and partition chromatography. Adsorption depends on selective adhering of compounds to a porous substance, while partition depends on partitioning the mixture’s components between two solvents 2 . In this experiment, student will do thin-layer chromatography and paper chromatography. The goal of this experiment is to identify the ingredients in a common pain killer, or analgesic. Some of these might be aspirin, acetominophen, ibuprofen, caffeine, salicylamide, or pyrilamine. Commercial pain-killers contain mixtures of compounds so students will not be able to use melting point as a comparison technique.
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