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Moisture Analysis in Lotion by Karl Fischer Coulometry. An Experiment for Introductory Analytical Chemistry
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Abstract
This paper describes an experiment that can be used in an introductory analytical chemistry laboratory course. It allows the student analyst to measure the moisture content of various hand and body lotions using the coulometric Karl Fischer (KF) technique, providing a modern alternative to the traditional electrochemical experiments usually explored in introductory analytical chemistry courses. The experiment introduces students to an important technique in industry and commerce, which is highly sensitive, accurate, and precise, and which can be used to study a wide range of samples. The measurement times are short, allowing students to experience the analytical problem-solving process from start to finish in a single 3-hour laboratory period. One KF coulometer can adequately service even a large analytical chemistry class (>80 students). In spring 2000, students identified the KF experiment as the most popular, most useful, and most educational experiment in our analytical chemistry laboratory curriculum.
Keywords (Audience):
Second-Year UndergraduateKeywords (Domain):
Analytical ChemistryKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
Consumer ChemistryCiting Articles
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This article has been cited by 6 ACS Journal articles (5 most recent appear below).
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Victoria C. Dominguez, Cole R. McDonald, Matt Johnson, Doug Schunk, Rod Kreuter and Dan Sykes, Benjamin T. Wigton and Balwant S. ChohanJournal of Chemical Education2010 87 (9), 987-991The instrumentation found in laboratories today is unaffordable for many secondary schools and universities. Although most analytical chemistry curricula at the undergraduate level teach students the principles behind modern instruments, few courses are ...
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- Received: August 03, 2009
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