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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.
Separation Science |
Laboratory Equipment / Apparatus
Centrifuge Centrifuging safety considerations, centrifuging a sample, loading and unloading a centrifuge, removing the supernatant, and washing the precipitate are discussed and demonstrated.
Quantitative Assay for Starch by Colorimetry Using a Desktop ScannerKurt R. Mathews, James D. Landmark, and Douglas F. Stickle Here we describe a procedure to produce a standard curve for quantification of starch concentration using colorimetry. Mathews, Kurt R.; Landmark, James D.; Stickle, Douglas F. J. Chem. Educ.2004, 81, 702.
