PRÁTICAS ACADÊMICAS DE QUÍMICA ANALÍTICA QUALITATIVA: EXPERIMENTOS DE BAIXO CUSTO PARA IDENTIFICAÇÃO DOS CÁTIONS Fe2+, Zn2+, Al3+ e Mn3+

Abstract

Working on the theme of determination of cations by volumetry with low-cost experiments, it can be observed how this methodology becomes attractive for high school students, using concepts from the field of Qualitative Analytical Chemistry. To carry out the experiments, easily accessible alternative materials were used to replace reagents that contained high concentrations, such as, for example, sulfuric acid (automotive battery solution) and hydrogen peroxide (oxygenated water), being diluted solutions, zinc (plate of AA battery), iron (steel wool), Hume stone (Aluminum) and Potassium Permanganate (Manganese) being metallic sources for the experiments. Through these experiments we can qualitatively determine the four elements of the Cation III group. In addition, several theories related to the discipline of Chemistry can be studied, such as stoichiometry, thermochemistry, chemical kinetics, volumetry and mixtures of solutions, topics already covered in High School, being a simple experiment, performed safely.