Lecture Lab C - Simple and Fractional Distillation February...

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Simple and Fractional Distillation February 13 th , 2009
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Abstract Basic summary-no introduction or background Contains actual results-not just we did a reaction and characterized the products Does not contain excessive information (such as that the product was dried over MgSO 4 ) Does not contain any intro material
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What is the most important -Reaction -Yield -Melting Point Abstract : Acetylsalicylic acid was prepared from salicylic acid and excess acetic anhydride with a phosporic acid catalyst. The acetylsalicylic acid was isolated in 64% yield, and the identity was confirmed with a melting point determination
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Distillation
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Ancient Technique Vaporizing and recondensing solvents Distillation vessels date to 3500 BC, and were used to prepare perfumes and elixirs Moonshine stills!
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Widely Used today
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Boiling Points Size (molecular weight) Pentane 35-36ºC Hexane 69°C Heptane 98°C Intermolecular Forces Pentane 35-36ºC Butyraldehyde 75 ºC Butanol 118 ºC OH O
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Class 1: Simple Distillation Used to separate volatile compounds from much less volatile compounds Example: dichloromethane (bp 35ºC) from caffeine/chlorophyll (sublimation point 278ºC
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Class 2: Vacuum Distillation Compounds that boil at too high a temperature or that decompose near the boiling point To vacuum
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What does it mean for a solution to boil? Vapor Pressure=Atmospheric Pressure
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This note was uploaded on 03/24/2009 for the course CHEMISTRY 030.225 taught by Professor Janegreco during the Spring '09 term at Johns Hopkins.

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Lecture Lab C - Simple and Fractional Distillation February...

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