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The Distribution Constant of Iodine between Aqueous and Organic Phases

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Sean A. C. McDowell

Department of Biological and Chemical Sciences, University of the West Indies, Cave Hill Campus, Bridgetown, Barbados

J. Chem. Educ., 2000, 77 (9), p 1213

DOI: 10.1021/ed077p1213

Publication Date (Web): September 1, 2000

Section:

History, Education, and Documentation

Abstract

The distribution equilibrium constant of iodine between water and the water-insoluble organic solvent octamethylcyclotetrasiloxane was determined by a titrimetric method. Octamethylcyclotetrasiloxane is an alternative to the more commonly used carbon tetrachloride, which is suspected of causing cancer. The stability equilibrium constants for the iodine-chloride (I₂Cl^-) and iodine bromide (I₂Br^-) complex trihalide ions was also estimated from a linear least-squares graphical plot.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Equilibrium

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Received: August 03, 2009

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The Distribution Constant of Iodine between Aqueous and Organic Phases