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6A_Lecture_4_with_ink - Lecture 4 Sublimation Experiment 4...

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Unformatted text preview: Lecture 4 Sublimation Experiment 4 Infrared Spectroscopy The process of moving from the solid phase to a vapor directly 1. Must vaporize without melting 2. Must be stable to decomposition 3. Vapor must condense back to a solid 4. Impurities present must not sublime A vacuum source may be used in order to create an artificial condition to help meet these needs Isolation of Caffeine and Sublimation Partition coefficient (K) of caffeine is 1.8 in CH 2 Cl 2 /H 2 O) An emulsion will occur so use the centrifuge and a centrifuge tube to separate the layers Isolate caffeine from tea Sublime the caffeine ◦ Calculate the % recovery When taking a MP of caffeine ◦ Seal the MP tube ◦ This increases the pressure inside as you heat Set up expt 5 before you leave lab Spectroscopic Methods Infrared- functional groups NMR- number of nuclei and their connections Mass Spectrometry- measurement of molecular mass and the mass of its fragments Chemists use a combination of these tools to deduce the molecular structure...
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This note was uploaded on 08/14/2010 for the course BIO 2010 taught by Professor Le during the Summer '10 term at UCSB.

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6A_Lecture_4_with_ink - Lecture 4 Sublimation Experiment 4...

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