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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > September  >
In the Laboratory
Measurement of the Isotopic Ratio of 10B/11B in NaBH4 by 1H NMR
Murray Zanger and Guillermo Moyna
Department of Chemistry and Biochemistry, University of the Sciences in Philadelphia, Philadelphia, PA 19104-4495
Cover
September 2005
Vol. 82 No. 9
p. 1390
Abstract
A simple and remarkably accurate method for estimating the isotopic ratio between 10B and 11B through the use of 1H nuclear magnetic resonance (NMR) spectroscopy is presented. The experiment relies on the splitting caused by 10B (I = 3) and 11B (I = 3/2) on the 1H signal of a proton directly bound to boron, a phenomenon readily observed on an aqueous sample of NaBH4. In combination with a brief lecture or prelaboratory presentation, this laboratory can serve to introduce students to magnetic properties as well as theoretical and experimental aspects of NMR spectroscopy as early as the freshman-level chemistry.
Supplement
An expanded NMR background section and instructions for this experiment are available.
*  Contents JCE2005p1390W.doc (Microsoft Word)
*  Download
JCE2005p1390W.pdf

JCE2005p1390W.zip
More Information
*  Citation
 Zanger, Murray; Moyna, Guillermo. J. Chem. Educ. 2005 82 1390.
*  Keywords
 Analytical Chemistry; Atomic Properties / Structure; Boron; First-Year Undergraduate / General; Hands-On Learning / Manipulatives; Instrumental Methods; Isotopes; Laboratory Instruction; Magnetic Properties; NMR Spectroscopy; Physical Chemistry; Second-Year Undergraduate; Sodium
*  History
 Created:
Last Updated:		 August 2, 2005
August 10, 2005
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