Description of a Systematic Model for the Construction and Interpretation of Logarithmic Diagrams Applied to Redox Equilibria
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Jorge Humberto Guevara Londoño [1] ; Johan Santiago Bernal Sotelo [1] ; Diego Alexander Blanco Martínez [1]
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[1] Universidad Pedagógica Nacional, Colombia
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 102, Nº 10, 2025, págs. 4314-4321
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
This article focuses on describing a systematic model for constructing, describing, and interpreting logarithmic diagrams as a graphical method for representing redox chemical equilibria. This model considers concepts such as electron potential (pe), the chemical equilibrium constant (Kd), and the standard reduction potential (E0). The term “pe” is mathematically defined as pe = log e–, where e– represents the activity of electrons in a redox system. Mathematical logarithmic expressions are proposed to graph the behavior of the species involved in the chemical equilibrium with regard to pe. These logarithmic diagrams enable the analysis of redox equilibria in terms of reactivity, stability, and predominance of a species and its redox pair. The proposed model can be integrated into Inorganic and Analytical Chemistry courses, as it involves a range of mathematical concepts and elements, including diagrams, exponential and logarithmic equations, and polynomials. These components are closely associated with topics such as redox equilibrium, chemical equation balancing, the redox behavior of a chemical species, and material balances. Collectively, they represent both conceptual and procedural frameworks that support the development of scientific competencies.
