Chem 3al lecture - Purifying Solids Sublimation/Deposition Chromatography Recrystallization Recrystallization Step 1 Choosing the right equipment

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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 Δ G mixture = Δ H mixture- T Δ 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 don’t 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 06/24/2010 for the course CHEM 3AL taught by Professor Li during the Spring '08 term at University of California, Berkeley.

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Chem 3al lecture - Purifying Solids Sublimation/Deposition Chromatography Recrystallization Recrystallization Step 1 Choosing the right equipment

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