Uso da flor de hibisco e da cebola roxa como indicadores naturais para avaliar o PH de frutas cítricas: uma abordagem didática para o ensino de equilíbrio em meio aquoso

Abstract

Students have a view that Chemistry, as a Science, is something complex, difficult to understand, because it is transmitted in the form of memorization and that very little is related to their daily lives. Therefore, the importance of contextualizing the theoretical with the practice in chemistry teaching, considering the relevance of practical activitiesin teaching. The use of tools that improve the student's teaching-learning process is fundamental for their growth. Then, the objective of this work is to show that by determining the pH of citrus fruits using hibiscus flower and red onion extract as natural indicators, it is possible to understand more clearly the content Equilibrium in Aqueous Medium, in addition to showing that this experiment it is possible to be applied in the classroom, due to the use of low-cost materials. Textbooks, which schools rely on, are no longer enough for the student's learning process, as assessed. The evaluation made shows that experiments are not something that is common to find in books, which means that the student is unable to relate what is being discussed in the classroom with his daily life. Experimentation will facilitate the teacher in his didactic approach, with a contextualization of theory with practice, being an interesting tool to increase student performance. With this, the present work presents satisfactory results, being able to identify the pH of citrus fruits with the indicators used, which allows inferring that they can be used as a teaching tool by the Chemistry teacher, without the need for a laboratory equipped.