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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > February  >
In the Laboratory
Magnetic Stirring with the Stirring Bar Length Exceeding the Vessel Diameter
Kirk W. Payne
Department of Chemistry, Oklahoma State University, Stillwater, OK 74078

James M. Lucas
Department of Physics, Oklahoma State University, Stillwater, OK 74078

Edmund J. Eisenbraun
Department of Chemistry, Oklahoma State University, Stillwater, OK 74078
Cover
February 2002
Vol. 79 No. 2
p. 217
Abstract
An improved method for vigorously stirring small volumes of viscous reaction mixtures is described. A description of the movement of a magnetic stirring bar, oriented vertically in a test tube so that it cannot align freely with the magnetic field of the stirrer magnet, is included. This confinement results in more vigorous mixing of small volumes through use of larger and more powerful stirring bars in a reduced volume of liquid as compared to conventional magnetic stirring. The influence of stirring bar shape and size on stirring effectiveness when used with the stirring bar oriented in this manner also is described.
More Information
*  Citation
 Payne, Kirk W.; Lucas, James M.; Eisenbraun, Edmund J. J. Chem. Educ. 2002 79 217.
*  Keywords
 Laboratory Equipment / Apparatus; Laboratory Instruction; Magnetic Properties; Solutions / Solvents
*  History
 Created:
Last Updated:		 January 2, 2002
March 16, 2005
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