Click on the title of a resource to view it. To save screen space, only the first 3 resources are shown. You can display more resources by scrolling down and clicking on “View all xx results”.
For the textbook, chapter, and section you specified we found
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
Extraction Use of a separatory funnel to carry out extraction is demonstrated.
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
An Improved Method for the Extraction and Thin-Layer Chromatography of Chlorophyll a and b from SpinachHao T. Quach, Robert L. Steeper, and G. William Griffin A direct method of extracting plant pigments from spinach leaves into a dry organic solvent is presented. This method avoids liquidliquid extractions and subsequent drying as is found in previously reported methods. Quach, Hao T.; Steeper, Robert L.; Griffin, G. William. J. Chem. Educ.2004, 81, 385.
Chromatography |
Natural Products |
Plant Chemistry |
Separation Science |
Thin Layer Chromatography
A Discovery Approach to Three Organic Laboratory Techniques: Extraction, Recrystallization, and DistillationGail Horowitz In each experiment, one or more parameters, such as solvent volume, time, or boiling point difference, is varied. Students compare the results of all variations and draw conclusions as to the underlying principles. The article concludes with an assessment of the effectiveness of these experiments. Horowitz, Gail. J. Chem. Educ.2003, 80, 1039.
