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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > May  >
In the Laboratory
Teaching pH Measurements with a Student-Assembled Combination Quinhydrone Electrode
Fritz Scholz, Tim Steinhardt, Heike Kahlert, and Jens R. Pörksen
Institut für Chemie und Biochemie, Universität Greifswald, D-17489 Greifswald, Germany

Jürgen Behnert
GAT Gamma Analysentechnik GmbH, D-27576 Bremerhaven–Lehe, Germany

Cover
May 2005
Vol. 82 No. 5
p. 782
Abstract
A combination pH electrode that can be assembled by the student is described. It consists of a glass holder and two sensors in the form of rubber stoppers that contain quinhydrone and graphite. The combination electrode is suitable to teach potentiometric measurements, pH measurements, and the interplay of acid–base and redox equilibria. The electrode meets highest safety standards and overcomes the troubles associated with the use of the conventional quinhydrone electrode. Compared with commercial combination glass electrodes, the combination quinhydrone electrode has the didactic advantage that the sensor and the reference electrodes are both visible and not preassembled.
Supplement
A handout for the students, including a prelab assignment, and notes for the instructor are available.
*  Contents JCE2005p0782W.doc (Microsoft Word)
*  Download
JCE2005p0782W.pdf

JCE2005p0782W.zip
More Information
*  Citation
 Scholz, Fritz; Steinhardt, Tim; Kahlert, Heike; Pörksen, Jens R.; Behnert, Jürgen. J. Chem. Educ. 2005 82 782.
*  Keywords
 AcidÐBase Chemistry; Analytical Chemistry; pH teaching*
*  History
 Created:
Last Updated:		 March 28, 2005
April 15, 2005
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