CO2 - Potentiometric Determination and Electrode Construction, a Hands-on Approach

Eduardo Cortón , Liliana Haim , Guillermo Locascio and Lydia Galagosky
Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pab. II, (1428) Capital Federal, Argentina
Santiago Kocmur
Instituto Antártico Argentino, Ciencias del Mar, Química-Acuario, Cerrito 1248, Cap. Fed. (1428), Argentina
J. Chem. Educ., 1999, 76 (9), p 1253
DOI: 10.1021/ed076p1253
Publication Date (Web): September 1, 1999

Abstract

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.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Instrumental Methods
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  • Received: August 03, 2009

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