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Micelles in the Physical Chemistry Laboratory: Diffusion Coefficients and Half-Wave Potentials of Ferrocene

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Kathryn R. Williams and Roberto Bravo

Department of Chemistry, University of Florida, Gainesville, FL 32611-7200

J. Chem. Educ., 2000, 77 (3), p 392

DOI: 10.1021/ed077p392

Publication Date (Web): March 1, 2000

Section:

History, Education, and Documentation

Abstract

In a new experiment for the physical chemistry laboratory, cyclic voltammetry and chronocoulometry are used to measure the diffusion coefficients and half-wave potentials for ferrocene (Fc) in three micellar media (dodecyltrimethylammonium bromide, cetyltrimethylammonium bromide, and sodium dodecylsulfate) and a simple supporting electrolyte (tetrabutylammonium bromide). The experiment presents an excellent opportunity for students to appreciate the use of surfactants as solubilizing media and to observe the effects of micelle size and charge on both the diffusion coefficient of the ferrocene molecule and the E_1/2 of the Fc⁺/Fc couple.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Transport Properties

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Micelles in the Physical/Analytical Chemistry Laboratory. Acid Dissociation of Neutral Red Indicator
Kathryn R. Williams and Loretta H. Tennant
Journal of Chemical Education2001 78 (3), 349
- Micelles in the Physical/Analytical Chemistry Laboratory. Acid Dissociation of Neutral Red Indicator
  Kathryn R. Williams and Loretta H. Tennant
  Journal of Chemical Education2001 78 (3), 349
  This paper describes the third in a series of laboratory experiments demonstrating the effects of micelles on physicochemical properties. The acid dissociation constant for neutral red indicator is measured spectrophotometrically in water and in solutions ...
  Abstract | Hi-Res PDF | PDF w/ Links
Micelles in the Physical Chemistry Laboratory. Kinetics of Hydrolysis of 5,5'-Dithiobis-(2-nitrobenzoate) in Basic Solution
Kathryn R. Williams
Journal of Chemical Education2000 77 (5), 626
- Micelles in the Physical Chemistry Laboratory. Kinetics of Hydrolysis of 5,5'-Dithiobis-(2-nitrobenzoate) in Basic Solution
  Kathryn R. Williams
  Journal of Chemical Education2000 77 (5), 626
  This paper describes the second in a series of laboratory experiments demonstrating the effects of micelles on physicochemical properties. The kinetics of the hydrolysis of 5,5'-dithiobis-(2-nitrobenzoate) (DTNB2-) in basic solution are studied by UV ...
  Abstract | Hi-Res PDF | PDF w/ Links