JCE Online Journal of Chemical Education
 | Subscriptions  | Software Orders  | Support  | Contributors  | Advertisers  | 

JCE Print
   Current Issue
 Previous Issues
 Supplements
 Search JCE Index

JCE Digital Library
   DigiDemos
 QBank
 SymMath
 WebWare

JCE Software
   Latest Releases
 Software & Video
 Downloads
 Support

Only@JCE Online
   JCE Online Store
 JCE HS CLIC
 JCE Discussion Forums
   Biographical Snapshots
 ChemEd Resource Shelf
 Featured Molecules
 Hal's Picks
 Project Chemlab
 Reviewed WWW Sites
 "Web-Ed" Articles

About JCE
   Features
 Publications
 Operations
 Outreach
 Contact Us


  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > September  >
Research: Science and Education
Reduction of Iodine by Phosphorus(I): Integration of the Rate Equation
Kenneth Kustin
Department of Chemistry, Brandeis University, Waltham, MA 02454-9110

Edward W. Ross
U.s. Army Soldier Biological and Chemical Command, Natick Soldier Center, Combat Feeding Innovative Science Team, Natick, MA 01760-5018

Cover
September 2005
Vol. 82 No. 9
p. 1413
Abstract
The reduction of iodine by phosphorus(I) (hypophosphorous acid) yields iodide and phosphorus(III) (phosphorous acid). The reaction is autocatalytic in hydrogen ion, autoinhibitory in iodide ion, and zero order in iodine over a wide concentration range. We return to the original article by A. D. Mitchell that presents a mechanism to account for these facts and devise a method to integrate numerically the complex rate equation for this reaction. Integration is combined with nonlinear curve-fitting to determine the rate-limiting rate constant and provide a fit to the data that is considerably improved over the original. The entire exercise provides an excellent case study for introducing the student to numerical integration and curve-fitting of complex nonlinear reaction dynamics.
Supplement
Appendices I, II, and III are available.
*  Contents JCE2005p1413W.doc (Microsoft Word)
*  Download
JCE2005p1413W.pdf

JCE2005p1413W.zip
More Information
*  Citation
 Kustin, Kenneth; Ross, Edward W. J. Chem. Educ. 2005 82 1413.
*  Keywords
 Chemometrics; Computer-Based Learning; Graduate Education / Research; Inorganic Chemistry; Kinetics; Mathematics / Symbolic Mathematics; Mechanisms of Reactions; Oxidation / Reduction; Physical Chemistry; Rate Law; Reactions; Upper-Division Undergraduate
*  History
 Created:
Last Updated:		 August 2, 2005
August 10, 2005
<< Previous Article Table of Contents Next Article >>
  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > September  > Page 1413


Subscriptions
 Subscription Info
 Order Forms

JCE HS CLIC

Our Secondary School editors work hard to distill all the JCE materials to produce a fraction of particular interest to high school teachers. We call it CLIC.
 JCE HS CLIC

Contributions Welcome
JCE welcomes your submission
 Contributors' Corner

Advertisers
In recent years we have worked hard to better match our advertisers with our readers. When shopping for chemistry education materials, visit our advertisers' WWW sites first.
 Recent Advertisers

Be An Ambassador
Take JCE along on your outreach missions. Copies of the Journal, guest access to JCE Online, our publications catalog, and more are available for your participants.
 Outreach with JCE

Comments to
jceonline@chem.wisc.edu		 Copyright © Division of Chemical Education, Inc., American Chemical Society.
All rights reserved.