Ellingham and Van't Hoff diagrams: some considerations

Quimica nova

Chagas, Aécio Pereira¹  Simoni, José de Alencar¹ 

[1] Universidade Estadual de Campinas, Campinas, Brasil

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

DOI  :  10.1590/S0100-40422007000200047

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The main subjectof this article is to show the parallelism betwen the Ellingham and Van't Hoffdiagrams. The first one is a graphic representation of the changes in the standardGibbs free energy (DrGq)as a function of T and was introduced by Ellingham in 1944, in orderto study metallurgic processes involving oxides and sulphides. On the otherhand, the Van't Hoff diagram is a representation of the function ln Kversus (1/T). The equivalence between both diagrams is easily demonstrated,making simple mathematical manipulations. In order to show the parallelism betweenboth diagrams, they are presented briefly and two examples are discussed. Thecomparison of the both diagrams surely will be helpful to students and teachersin their learning and teaching activities, and will certainly enrich importantaspects of chemical thermodynamics.

【 授权许可】

CC BY