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  Home > JCE Print > Journal of Chemical Education > Issues > 2001  > June  >
In the Laboratory
A Simple Computer-Interfaced Calorimeter: Application to the Determination of the Heat of Formation of Magnesium Oxide
Sze-Shun Wong, Natasha D. Popovich, and Shelley J. Coldiron
Department of Chemistry, Iowa State University, Ames, IA 50011
Cover
June 2001
Vol. 78 No. 6
p. 798
Abstract
This paper describes the design, construction, and laboratory instructional application of a simple computer-controlled, constant-pressure calorimeter. The calorimeter was made using a covered Styrofoam cup as the reaction chamber. A thermistor was used as a temperature-sensing element and was incorporated in a temperature-to-voltage converter circuit based on a bridge amplifier. The instrument was interfaced to a personal computer via an I/O board, and data acquisition software was used to monitor the output voltage of the bridge amplifier. The design and construction of this instrument offer many possible applications of operational amplifiers and related basic electronics theory in chemistry and in interfacing experiments to computers. One application, the determination of the enthalpy of formation of magnesium oxide by applying Hess's law of heat of summation, is demonstrated in this paper. Experimental results for the heat of formation for magnesium oxide were within 1% of the literature value. This experiment also demonstrates the utility and ease of automating temperature measurements for other applications.
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The full text of the laboratory experiment with figures is available.
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*  Citation
 Wong, Sze-Shun; Popovich, Natasha D.; Coldiron, Shelley J. J. Chem. Educ. 2001 78 798.
*  Keywords
 Analytical Chemistry; Calorimetry; Instrumental Methods; Laboratory Instruction; Thermodynamics
*  History
 Created:
Last Updated:		 May 8, 2001
August 31, 2005
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