A utilização do tratamento de água para o ensino de Química Geral no Ensino Médio

Abstract

Water is a fundamental resource for humanity, through its role in generating electrical energy, regulating the climate, and is essential for agricultural and industrial production. In this way, water treatment is an extremely important process, being divided into several stages, where Chemistry is very present, encompassing several topics involved in high school such as: Acids, Bases, Separation of Mixtures, pH and Density. Therefore, this work seeks to explain these themes, using an approach that includes an expository class and an experimental class. The latter occurs through a simulation of stages of the water treatment process on a smaller scale, when compared to that carried out by companies in this sector. In this activity, water treatment was carried out using viable reagents found mostly in supermarkets, with the help of laboratory glassware. Each trio of students follows a script to treat a sample of water from homes, resulting from washing dirty dishes and cloth used to clean floors. In this way, social and emotional aspects of the students were involved through the cooperation of team members during the process, addressing an appreciation of the water resource through knowledge of the treatment stages and demonstrating the importance of Chemistry in everyday life through learning theoretically as well as practically. Given the above, the proposed activity was carried out with two 3rd year high school classes, with the first stage of the work consisting of explaining the theoretical contents of the experiment in the classroom with a pre-laboratory activity proposed at the end. The second stage consisted of applying the practice in a laboratory, with each team carrying out the procedure, followed by the third stage, which consisted of applying a questionnaire regarding the teaching methodology, aiming to verify the level of learning, feedback and socio-emotional skills acquired during o process.