Atividades experimentais no ensino de química: indicadores ácido-base alternativos

Abstract

The present work approaches the teaching of acids and bases, using alternative indicators, such as açaí, red cabbage, beetroot and jambo, aiming to improve students' understanding through a contextualized action. The research was applied in person to 24 students from a 2nd year class of the Integrated Technical Marketing and Advertising course at the Instituto Federal do Amapá, Santana campus, with the objective of employing a methodology aimed at teaching chemistry, using the extract of açaí, jambo, red cabbage and beetroot, as a natural indicator of acids and bases. The research was carried out through a quantitative and qualitative approach with results obtained through the application of two questionnaires, composed of open questions, applied at different times, before and after the class. The nature of the research was based on applied research, since the proposal was to gather information for the elaboration of specific results, as for the research procedure, action research was used, which involves both the researcher and the researched in the development of the objective of the analysis. The results showed that the fruits are a good option to use as an indicator, as it performs such a satisfactory teaching function, through color variation. It is a simple and low-cost methodology, being a good choice in schools without adequate laboratories or materials. The proposal helped students to understand the importance of the applications of the subject discussed in everyday life and how their knowledge is essential today. The dynamics provided the approach and discussion of Chemistry contents, as well as its analogy with aspects of the students' daily life.