QUESTIONING THE RELEVANCE OF SOLUTION pH CALCULATION

André Fernando de Oliveira

doi:10.18540/jcecvl6iss2pp0147-0151

Auteurs

André Fernando de Oliveira DEQ (Departamento de Química/UFV) https://orcid.org/0000-0003-4158-6098

DOI :

https://doi.org/10.18540/jcecvl6iss2pp0147-0151

Mots-clés :

Second-Year Undergraduate, Aqueous Solution Chemistry, Problem Solving, Acids / Bases

Résumé

A brief discussion on the unnecessary calculation of pH in solution was done, as the historical reasons for this need before the invention of commercial pH meter was widely diffused. An alternative approach for acid-base equilibrium evaluation was proposed, without approximation or need of application only for simple solutions. The central aspect for the new approach is the determination of equilibrium concentration of all chemical species in solution, including the strong acid or base concentration for adjusting of pH of solutions. Therefore, the proposed method allowed the calculation in a mixture, including several polyprotic systems. Two detailed examples were presented. The effective electrical charge parameter was formally defined.

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Biographie de l'auteur

André Fernando de Oliveira, DEQ (Departamento de Química/UFV)

possui graduação em Bacharelado Em Química pela Universidade Federal de São Carlos (1994), mestrado em Química pela Universidade Federal de São Carlos (1996) e doutorado em Química pela Universidade Federal de São Carlos (1999).Foi Pesquisador no Núcleo de Ciências Ambientais da Universidade de Mogi das Cruzes (2002-2009) e coordenador dos Cursos de Química-UMC o período de 2005-2008. Atualmente é Professor Adjunto I na Universidade Federal de Viçosa. Suas linhas de pesquisa envolvem Química Ambiental e Química Analítica com ênfase em Equilíbrio Químico, Interação Metal-Solo-Organismos e Instrumentação Analítica.