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1999
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In the Laboratory
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CO2 - Potentiometric Determination and Electrode Construction, a Hands-on Approach
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Santiago Kocmur
Instituto Antártico Argentino, Ciencias del Mar, Química-Acuario, Cerrito 1248, Cap. Fed. (1428), Argentina
Eduardo Cortón, Liliana Haim, Guillermo Locascio, and Lydia Galagosky
Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pab. II, (1428) Capital Federal, Argentina
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September 1999
Vol. 76 No. 9
p. 1253
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| Abstract |
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This work presents a hands-on activity in which the principles of gaseous equilibria and electrochemical potentials are applied to the construction of a carbon dioxide detector. The device is constructed using a combination pH electrode and a minimal amount of inexpensive, normally available laboratory materials. The standardized sensor achieves a linear response between 0.05 and 2 mM, with a response speed under 1 min for [CO2] around 0.5 mM. To increase students' interest, the detector is used for measuring [CO2] in carbonated beverages and monitoring the metabolic activity of yeast. The construction, calibration and application of the carbon dioxide detector can be accomplished in a 3 - 4-hour laboratory session.
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| More Information |
 Citation |
Kocmur, Santiago; Cort—n, Eduardo; Haim, Liliana; Locascio, Guillermo; Galagosky, Lydia. J. Chem. Educ. 1999 76 1253.
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Keywords |
Analytical Chemistry; Instrumental Methods; Electrochemistry; Gases; Quantitative Analysis; Teaching / Learning Aids
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History |
Created:
Last Updated: |
July 30, 1999
June 23, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
1999
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