Diagramas de Ellingham e de Van't Hoff: algumas considerações

Química Nova

José De Alencar Simoni¹  Aécio Pereira Chagas¹ 

[1] ,Universidade Estadual de Campinas Instituto de Química Campinas SP ,Brasil

关键词: Ellingham diagram;    Van't Hoff diagram;    chemical thermodynamics;   

DOI  :  10.1590/S0100-40422007000200047

来源: SciELO

【 摘 要 】

The main subject of this article is to show the parallelism betwen the Ellingham and Van't Hoff diagrams. The first one is a graphic representation of the changes in the standard Gibbs free energy (deltarGtheta) as a function of T and was introduced by Ellingham in 1944, in order to study metallurgic processes involving oxides and sulphides. On the other hand, the Van't Hoff diagram is a representation of the function ln K versus (1/T). The equivalence between both diagrams is easily demonstrated, making simple mathematical manipulations. In order to show the parallelism between both diagrams, they are presented briefly and two examples are discussed. The comparison of the both diagrams surely will be helpful to students and teachers in their learning and teaching activities, and will certainly enrich important aspects of chemical thermodynamics.

【 授权许可】

CC BY-NC   
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