El Principio de Dureza y Blandura aplicado a la enseñanza de la Química Inorgánica en un curso de Química General e Inorgánica

SALA LUIS FEDERICO; GONZÁLEZ JUAN CARLOS; GARCÍA SILVIA ISABEL; FRASCAROLI MARÍA INÉS; MANGIAMELI MARÍA FLORENCIA; BLANES PATRICIA SILVIA; GARCÍA JOUSY

Santa Fe

Jornada; Vi Jornadas Internacionales - IX Jorandas Nacionales; 2010

Universidad Nacional del Litoral

Título: EL PRINCIPIO DE DUREZA Y BLANDURA APLICADO A LA ENSEÑANZA DE LA QUÍMICA INORGÁNICA EN UN CURSO DE QUÍMICA GENERAL E INORGÁNICA The Hard and Soft Acid-Base Principle applied to the teaching of Inorganic Chemistry at a General and Inorganic Chemistry Course. Autores: Sala Luis Federico, González Juan Carlos, García Silvia Isabel, Frascaroli María Inés, Mangiameli María Florencia, Blanes Patricia Silvia, García Jousy. Lugar: Área Química Inorgánica, Departamento de Químico Física, Facultad de Ciencias Bioquímicas y Farmacéuticas (FCByF), Universidad Nacional de Rosario (UNR). Suipacha 531, Rosario (2000) Argentina. Área Temática: Programas de mejoramiento de la enseñanza de la Química en el primer año universitario Palabras Claves: Hard, Soft, Acid, Base, Coordination Resumen: Introducción: An instructor may assign an experiment related to the qualitative analysis scheme in a General and Inorganic Chemistry course, but only the alternate version of the experiment. In this kind of experiment, you can discover the principle that enables us to make qualitative predictions of the predominant products that result when Lewis acids and Lewis bases compete with each other to form precipitates or complexes. The principle can be employed to organize the chemistry of such diverse phenomena as (1) qualitative analysis scheme in general chemistry; (2) activity series experiment; (3) geochemistry of the elements and why they occur in the ores in which the are found; (4) nutritional and toxic effects of many metals and nonmetals in the body and (5) ways in which medicinal chemists devise drugs to counteract the effect of heavy metal poisoning. In all of those propositions, you may ask: Which metal ion will tend preferentially to form a complex ion with which ligand? The answer to this question was summarized several years ago by Pearson(1) in the Hard-Soft Acid-Base Principle (HSABP) of Pearson: Hard (Lewis) acids tend to combine with hard (Lewis) bases and soft acids prefer soft bases. Descripción: The HSABP was applied to teach Inorganic Chemistry at a Freshman Level in an annual General and Inorganic Chemistry Course, where there is not enough time for this topic. Inorganic Chemistry was tought applying deductive properties of compounds through the Principles of General Chemistry developed at the beginning of the academic year and reinforce learning with the HSABP. Resultados y Conclusiones: At the general examination term, students were able to deduce which was the best ligand to eliminate poisoning metal ions in living organisms. Considering the students involved on the Careers proposed at Biochemical and Pharmaceutical Faculty Science of the Rosario National University (Biochemistry, Pharmaceutics, Chemistry -Bachelor and Professorship- and Biotechnology), when they finish their 1st year freshman level, are able to make predictions of the physical and chemistry properties about a chemical compound of particular interest, applying the HSABP. In this way, the will be better prepared not only to confront the Organic, Physicochemical and Analytical Chemistry Courses, but also to work in other academic and industrial areas, like metallurgy, medicine and toxicology. Bibliografía: (1) Pearson R. G., 2005, “Chemical Hardness and density functional theory” J. Chem.Sci,117 (5), 369-377. Fecha de envío: 26/02/2010 Estado: Aprobado