Experimentação problematizadora no ensino da química: um estudo sobre ácidos e bases

Abstract

This work aims to analyze a problematizing experimentation proposal on acids and bases applied in a chemistry classroom, searching for promoting conceptual construction by students. For the theoretical discussion, we based discussions on: chemistry teaching, problematizing experimentation in the teaching-learning process, acids and bases. In the methodology, a didactic sequence was organized throughout 3 (three) pedagogical moments, namely: initial problematization, organization of knowledge and application of knowledge. Among others, an experimental problem-solving activity was carried out on acids and bases, using a red cabbage indicator, as it contains a substance called anthocyanins that present a characteristic color in specific acid or basic environment, allowing the identification of this property in relation to the analyzed substances. This study was carried out in a class of the 3rd year of a public High School, a reference school in education of the state of Pernambuco, located in Recife city. The approach of problematizing experimentation on acids and bases, in the classroom, contributed to the teaching-learning process, starting from the rising of the students' alternative conceptions on the concepts until the understanding of the scientific concept involved.