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Determination of pKa from Luminescence Quenching Data: An Undergraduate Laboratory Experiment

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Hector E. Gsponer , Gustavo A. Arguello and Gerardo A. Arguello

Departamento de Química Física, Fisicoquímicas y Naturales, Universidad Nactional de RÃo Cuarto, Estafeta No. 9, 5800 RÃo Cuarto, Argentina

J. Chem. Educ., 1997, 74 (8), p 968

DOI: 10.1021/ed074p968

Publication Date (Web): August 1, 1997

Section:

History, Education, and Documentation

Abstract

An experimental procedure is described to study the acid-basic equilibrium in aqueous solutions of phenolic compounds. The quenching of luminescence of the excited state of Ru(bpy)32+ complex by some phenol derivatives was successfully used to obtain the Stern-Volmer constant at different pH's and then to determine their acid dissociation constant (Ka). This procedure is suitable for an undergraduate physical chemical laboratory where the student get acquainted with fluorescence techniques and the principles of photochemistry as well as electron transfer processes combined with the equilibrium concept.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Photochemistry

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