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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 9 Issue 5 (2004) pp 285-287

Introducing the Concept of Internal Standard in Analytical Chemistry with a Conductimetric Titration

P. Asoka B. Marasinghe

Department of Chemistry, Minnesota State University Moorhead, Moorhead MN 56563,
Received March 2, 2004. Accepted July 14, 2004.

Published online: 1 October 2004

Abstract. A conductimetric acid–base titration that utilizes the concept of internal standard addition for the quantification of protic acid species is described. The standard addition of SO4–2 is employed for determination of HSO4 ions in aqueous solution. The method does not require accurate knowledge of the titrant, Ba(OH)2, and it can be extended for the quantitative analysis of species such as HSO3, HCO3, HPO4–2.

Key Words: Laboratories and Demonstrations; analytical chemistry; biochemistry; titration

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Issue date: October 1, 2004

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