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  Home > JCE Print > Journal of Chemical Education > Issues > 2007  > July  >
In the Laboratory
Imidazole as a pH Probe: An NMR Experiment for the General Chemistry Laboratory
William J. Hagan, Jr., Dennis L. Edie, and Linda B. Cooley
School of Mathematics and Sciences, College of St. Rose, Albany, NY 12203-1490
Cover
July 2007
Vol. 84 No. 7
p. 1188
Abstract
An experiment is described that employs the 1H-NMR signal of aqueous imidazole to determine the pH of an unknown solution. The procedure involves the preparation of a calibration curve, which is then used for the analysis of the unknown(s). The advantages of imidazole as a pH probe for near-neutral solutions are briefly discussed. The exercise is primarily intended for general chemistry students, but could also be employed in a course on instrumental analysis.
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Citation
Hagan, William J., Jr.; Edie, Dennis L.; Cooley, Linda B. J. Chem. Educ. 2007, 84, 1188.
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Keywords
Acids / Bases; Aqueous Solution Chemistry; Aromatic Compounds; Calibration; First-Year Undergraduate / General; Hands-On Learning / Manipulatives; Laboratory Instruction; NMR Spectroscopy; Organic Chemistry; pH; Physical Chemistry; Upper-Division Undergraduate
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History
Created:
Last Updated:
5/29/2007
6/7/2007
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