3AL-Lecture5 - Purifying Solids ! Sublimation/Deposition !...

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Unformatted text preview: Purifying Solids ! Sublimation/Deposition ! Chromatography ! Recrystallization Recrystallization Step 1: Choosing the right equipment The Glassware " Test tube " Erlenmeyer fask Richard Erlenmeyer Large surFace area Constricted opening Step 1: Choosing the right equipment The heating source " Water bath " Oil bath " Sand bath NEVER USE A BUNSEN BURNER FOR HEATING LIQUIDS IN THE ORGANIC CHEMISTRY LABORATORY! Step 2: Choosing a Solvent The Goal To fnd a solvent in which the solid is soluble at a higher temperature and less soluble or insoluble at a lower temperature. Heat Up Cool Down " G mixture = " H mixture- T " S mixture Step 2: Choosing a Solvent The Most Common Solvents water and ethanol H O H O H Other Common Solvents acetone, hexane , isopropanol , ethyl acetate O O O OH Boiling Range > 50 # 100 C Low boiling solvents evaporate too easily and dont allow for much energy input. High boiling solvents make it difFcult to dry the crystals after they have been recovered from the solution....
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This note was uploaded on 06/28/2010 for the course CHEM Chemistry taught by Professor Nitche during the Spring '08 term at University of California, Berkeley.

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3AL-Lecture5 - Purifying Solids ! Sublimation/Deposition !...

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