Uso de indicadores naturais ácido-base do contexto amazônico no ensino de equilíbrio químico
Year: 2024
Type: article
Abstract: This work was objective to investigate new natural acid-base indicators with potential application in experimental activities and in the context of the acid-base equilibrium. For this purpose, alcoholic and aqueous extracts from Buriti (Mauritia flexuosa), Camu-camu (Myrciaria dubia) fruits were tested and Dão (Ziziphus mauritiana) and leaves of the vegetable species sara-tudo (Justicia acuminatissima). The extracts were tested in HCl and NaOH solutions for the pH range 1 to 14, and as a context for teaching Chemistry, they were applied to products with acidic and basic characteristics present in our daily lives. The extracts of the camu-camu fruit and the leaves of sara-tudo showed the best acid-base indicators due to the greater distinction between colors at different pH values. Therefore, these extracts of acid-base indicators were used by students of the second series of regular high school, in experimental classes that addressed the content of acid-base equilibrium, and highlighted the importance of contextualizing the teaching of chemistry with their daily lives.
DOI: 10.24979/bp1acj03
Language: English
Subfield: Physical and Theoretical Chemistry
Field: Chemistry
Domain: Physical Sciences
SDG: Quality education
Open Access status: diamond
OpenAlex ID: W4404525124