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

TCE

The Chemical Educator

ISSN: 1430-4171 (electronic version)

Table of Contents

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, asoka@mnstate.edu
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

(*) Corresponding author. (E-mail: asoka@mnstate.edu)

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