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Chemical Kinetics in Real Time: Using the Differential Rate Law and Discovering the Reaction Orders

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B. R. Ramachandran and Arthur M. Halpern

Department of Chemistry, Indiana State University, Terre Haute, IN 47809

J. Chem. Educ., 1996, 73 (7), p 686

DOI: 10.1021/ed073p686

Publication Date (Web): July 1, 1996

Section:

History, Education, and Documentation

Abstract

The reaction between 2,4-dinitrochlorobenzene and piperidine to form 2,4-dinitrophenylpiperidine in ethanol is a very suitable experiment for the undergraduate physical chemistry laboratory. The reaction, being first order with respect to each reactant, exhibits overall second-order kinetics. In this paper we describe the kinetic anlysis, in real time, of the spectrometrically-acquired rate data based on the differential rate law, where no assumptions in initial reactant concentrations are necessary, except for their values. The use of scientific spreadsheets for the numerical differentiation and regression analysis is discussed. A distinctive advantage in analyzing the data this way is that it allows the student to "discover" the order of the reaction with respect to each reactant, and hence the rate law.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Kinetics

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Modern Developments in the Physical Chemistry Laboratory
Samuel A. Abrash
2007 973 (), 115-151
- Modern Developments in the Physical Chemistry Laboratory
  Samuel A. Abrash
  2007 973 (), 115-151
  Developments in the physical chemistry laboratory since the publication of the germinal text by Schwenz and Moore (1) are categorized and reviewed. The categories examined include modern instrumentation, current topics in chemistry, integrated ...
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