Imidazole as a pH Probe: An NMR Experiment for the General Chemistry Laboratory.

• Autores: William J. Hagan, Dennis L. Edie, Linda B. Cooley
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 84, Nº 7, 2007, págs. 1188-1189
• Idioma: inglés
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• Resumen

  • 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.