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The Chemical Educator

ISSN: 1430-4171 (electronic version)

Table of Contents

Abstract Volume 29 (2024) pp 67-74

Optimization of the Main Experimental Variables in the Iodometric Determination of Active Chlorine in Bleach. A Useful Laboratory Work for the Teaching and Learning of Redox Volumetry and the Application of Statistical Assistance in Analytical Chemistry

Miguel Cabezón, Federico Dezotti,†,‡ and Patricia Damiani*,†,‡,§

Departamento de Química Analítica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, Rosario S2002LRK, Argentina; Instituto de Química Rosario (IQUIR-CONICET), Suipacha 531, Rosario S2002LRK, Argentina; §Cátedra de Química Analítica Cuantitativa y Cátedra de Química Analítica, Facultad de Química e Ingeniería del Rosario, Pontificia Universidad Católica Argentina UCA Campus Rosario, Avenida Pellegrini 3314, Rosario S2002LRK, Argentina,
Received April 3, 2023. Accepted August 14, 2023.

Published: 5 February 2024

Abstract. An interesting experimental work, suitable for teaching and learning Analytical Chemistry, mainly in advanced levels courses, has been proposed in the present manuscript. During the developing of this experience, students can apply the theoretical knowledge of Volumetry (volumetric analysis in general and redox volumetry in particular) as well as of Statistics; so that this kind of work can be considered an “integral work” since two disciplines are related. The scope of this work is the optimization of the main variables, typically, amount of potassium iodide (KI) and reaction time for generating Iodine, in the iodometric determination of “active chlorine” in bleach. The use or not of starch as required indicator, is also discussed. Students will be able to select, apply, analyze and evaluate different statistical tools useful for Analytical Chemistry, such as Response Surface for optimizing variables and statistical parameter “Student T” for comparing results.

Key Words: Laboratories and Demonstrations; analytical chemistry

(*) Corresponding author. (E-mail: Argentina,

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