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Lecture 4 - create an artificial condition to help meet...

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Lecture 4
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You must WRITE and BUBBLE your name and Perm # Any corrections or additions will be put up on the projector
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Grade Checker http://www.chem.ucsb.edu/cgiwrite/grades/ Grades will be posted
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Quick note on Infrared Spectroscopy Sublimation Experiment 4
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Overtones Carbonyl compounds exhibit them (C=O stretch) Overtone peak shows up at ~3400 cm -1 Do not confuse this with an alcohol A concentration expt can be done to determine if it is an alcohol or an overtone.
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Overtone of cyclohexanone
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How do you separate (purify) organic compounds?? Distillation Extraction Recrystallization Sublimation Chromatography
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The process of moving from the solid phase to a vapor directly
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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
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Unformatted text preview: create an artificial condition to help meet these needs Determining the Partition Coefficient of Caffeine and Sublimation You will partition caffeine between dichloromethane and water An emulsion may occur so use the centrifuge and a centrifuge tube to separate the layers Calculate the K value for caffeine ◦ Determine the number of extractions necessary to recover 99% of the caffeine you started with Sublime the caffeine ◦ Calculate the % recovery When taking a MP of caffeine ◦ Seal the MP tube ◦ This increases the pressure inside as you heat Chapter 18: Infrared Spectroscopy Chapter 12: Sublimation Next week ◦ Chapter 15: Thin Layer Chromatography ◦ Chapter 19: Nuclear Magnetic Resonance...
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