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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > April  >
In the Laboratory
Topics in Chemical Instrumentation
A Smart-Laser-Based Calorimeter
Thomas Schneider, Mário J. Politi, and Mauricio S. Baptista
Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, SP 05513-970, Brazil
Cover
April 2002
Vol. 79 No. 4
p. 503
Abstract
A new method is proposed in which the enthalpy change derived from the complexation of ethylenediaminetetraacetic acid (EDTA) with a metal is calculated using a newly developed laser deflection calorimeter. The deflection signal observed after the complexation reaction is qualitatively compared with the deflection signal observed after the addition of small amounts of water at higher and lower temperatures than the environment. Thermochemical concepts behind the enthalpy change are clearly demonstrated. The deflection signal is calibrated using the HCl/NaOH neutralization reaction and the enthalpy change related to the magnesium and cadmium complexation with EDTA is calculated.
More Information
*  Citation
 Schneider, Thomas; Politi, Mário J.; Baptista, Mauricio S. J. Chem. Educ. 2002 79 503.
*  Keywords
 Calorimetry; Laboratory Equipment / Apparatus; Lasers / Laser Spectroscopy; Physical Chemistry; Quantitative Analysis; Thermal Analysis
*  History
 Created:
Last Updated:		 March 1, 2002
March 16, 2005
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