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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.
Laboratory Equipment / Apparatus |
Separation Science
Distillation Here we consider distillation including simple distillation, distillation at reduced pressure and using a rotary evaporator.
Water Filtration: Small Changes Make a DifferenceErica K. Jacobsen This Connections article highlights two suggestions to supplement JCE Classroom Activity #60: Water Filtration. Jacobsen, Erica K. J. Chem. Educ.2008, 85, 892.
Separation Science |
Water / Water Chemistry
Water FiltrationErica K. Jacobsen Students make a water filtration column using a 2-liter plastic bottle that contains layers of gravel, sand, and activated charcoal. Jacobsen, Erica K. J. Chem. Educ.2004, 81, 224A.
