CO2 - Potentiometric Determination and Electrode Construction. A Hands-on Approach

SANTIAGO KOCMUR; EDUARDO CORTON; LILIANA HAIM; GUILLERMO A. LOCASCIO; LYDIA GALAGOVSKY

Journal of Chemical Education

ACS Publications

Lugar: Madison; Año: 1999 vol. 76 p. 1253 - 1255

0021-9584

In an effort to improve science learning, we propose apractical approach, in which students build their own deviceto solve real-life problematic situations. In this way, interest,commitment, and concept acquisitions are increased. In thelaboratory activity described here, students construct a simplebut sensitive carbon dioxide detector. The device is a combinationpH electrode with the addition of a gas-permeablemembrane separated by a thin-film electrolyte solution (1, 2),as shown in Figure 1. Designing and building this device,using common and inexpensive laboratory materials, helpsstudents in an undergraduate analytical chemistry course tounderstand some electrochemistry principles and their applications(3–5).