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http://dx.doi.org/10.5012/jkcs.2003.47.3.283

An Analysis and Improvement of the Experiment about the Effect of Pressure on the Equilibrium of the NO2 - N2O4 System  

Eung-Gyu Kang (Konghang High School)
Seong-Joo Kang (Department of Chemistry Education, Korea National University of Education)
Publication Information
Journal of the Korean Chemical Society / v.47, no.3, 2003 , pp. 283-291 More about this Journal
Abstract
The purpose of this research was to analyze and improve the experiment, observing the color change under compression on the equilibrium of $2NO_2\;{\rightleftarrow}\;N_2O_4$ system, described in high school and general chemistry textbooks. Chemistry textbooks described that the reddish brown color got lighter on the compression of $2NO_2\;{\rightleftarrow}\;N_2O_4$ system. This misinterpretation was due to no consideration of $NO_2$ concentration increase by the volume decrease. In order to propose a correct interpretation, the changes of color and temperature on compression were quantitatively measured and compared with theoretical studies. In addition, an improved experiment, excluding the effect of $NO_2$ concentration increase, was proposed to observe only the color change of the net equilibrium shift.
Keywords
Equilibrium Shift; $NO_2; \; N_2O_4$ Effect of Pressure;
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