Experiment 6. Recrystallization and Melting Points: Recrystallization of an Unknown Solid and Decolorization of Brown Sugar, 236
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Recrystallization Recrystallization procedures using a single solvent and using two solvents are demonstrated.
Laboratory Equipment / Apparatus |
Separation Science
Separating and Purifying Laboratory processes frequently used to separate mixtures or purify substances including centrifuging, chromatography, distillation, extraction, filtration, and recrystallization are demonstrated.
Laboratory Equipment / Apparatus |
Separation Science
Centrifuging a SampleJohn W. Moore, Jerrold J. Jacobsen, Lois M. Browne, John F. Zimmerman The demonstration on this page shows a technique that should not be used by undergraduate chemistry laboratory. This video shows what happens to sample in a centrifuge while the centrifuge is on, and the result of stopping the centrifuge improperly. A narrative is included in this video: The centrifuging process allows the solvent to completely settle out. The jarring caused by hand braking destroys the distinct separation between supernatant and solid.
Designing and Conducting a Purification Scheme as an Organic Chemistry Laboratory PracticalKate J. Graham, Brian J. Johnson, T. Nicholas Jones, Edward J. McIntee, and Chris P. Schaller Describes an open-ended laboratory practical that challenges students to evaluate when different purification techniques are appropriate. Graham, Kate J.; Johnson, Brian J.; Jones, T. Nicholas; McIntee, Edward J.; Schaller, Chris P. J. Chem. Educ.2008, 85, 1644.
IR Spectroscopy |
Microscale Lab |
Molecular Properties / Structure |
NMR Spectroscopy |
Physical Properties |
Separation Science
The Resolution of Ibuprofen, 2-(4′-Isobutylphenyl)propionic AcidJames V. McCullagh In this experiment the over-the-counter pain reliever ibuprofen is resolved using (S)-(-)-a-phenethylamine as the resolving agent. This procedure has several key advantages over previous resolution experiments. McCullagh, James V. J. Chem. Educ.2008, 85, 941.
