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The Chemical Educator
ISSN: 1430-4171 (electronic version)
Abstract Volume 7
Issue 4 (2002) pp 211-213
Acid–Base Titration: Analysis of Phosphoric Acid Anodizing Solutions. A Problem-Based Learning Approach
Marina C. Koether* and Charles R. Munafo
Department of Chemistry and Biochemistry, Kennesaw State University,
Kennesaw, GA 30144
Received April 19,2002. Accepted May 7, 2002
Published online: 7 June 2002
Abstract. Phosphoric
acid anodizing solutions are routinely titrated to monitor their concentrations;
however, after successive anodizations of aluminum metal, increasing amounts
of dissolved aluminum interfere with the neutralization titration. The
true concentration of phosphoric acid is determined by a correction factor
based on the concentration of the dissolved aluminum, which is determined
industrially by flame atomic absorption spectrometry. The academic determination
of a correction factor for aluminum as well as copper can be designed
as a traditional or a problem-based learning exercise.
Key Words: Laboratories and Demonstrations; analytical chemistry; acid-base chemistry; problem-based learning; aluminum; copper; phosphoric acid
(*) Corresponding author. (E-mail: mkoether@kennesaw.edu)
Article in PDF format (152 KB) HTML format
Issue date: August
2, 2002
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