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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > December  >
In the Laboratory
Monitoring the Rate of Solvolytic Decomposition of Benzenediazonium Tetrafluoroborate in Aqueous Media Using a pH Electrode
Floyd L. Wiseman
Department of Chemistry and Life Science, United States Military Academy, West Point, NY 10996
Cover
December 2005
Vol. 82 No. 12
p. 1841
Abstract
Methods have been described by various authors for monitoring the solvolytic decomposition of the benzenediazonium ion (C6H5N2+) using a UV spectrometer. The benzenediazonium ion decomposes to yield nitrogen gas, which produces bubbles in the reaction mixture. If not immediately expelled from the reaction mixture, these bubbles will alter the effective cell path length and interfere with the UV signal. Within the context of an undergraduate laboratory, this can present a formidable problem. Results of this work show that the reaction can be accurately monitored in real time in an unbuffered solution using a pH electrode, whose signal is virtually unaffected by bubbles in the solution. This article discusses the use of pH electrodes to monitor the aqueous solvolysis of the benzenediazonium ion and shows that the results are in reasonable agreement with literature values.
Supplement
A detailed description of the experiment including a theory section and typical data.
*  Contents JCE2005p1841W.doc (Microsoft Word)
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*  Citation
 Wiseman, Floyd L. J. Chem. Educ. 2005 82 1841.
*  Keywords
 Amines / Ammonium Compounds; Aqueous Solution Chemistry; Calorimetry / Thermochemistry; Hands-On Learning / Manipulatives; Kinetics; Laboratory Instruction; Mechanisms of Reactions; pH; Physical Chemistry; Rate Law; Second-Year Undergraduate; Thermodynamics; Upper-Division Undergraduate
*  History
 Created:
Last Updated:		 October 25, 2005
November 4, 2005
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