Da extração dos pigmentos da hibiscus rosa-sinensis e da ixora chinensis até os indicadores naturais de ácido-base como recurso didático para a disciplina de química no ensino médio

Abstract

Chemistry is part of the group of subjects in high school level in the area of natural sciences whose jurisdiction covers the understanding of the natural sciences and technologies associated with them as human constructions, realizing their roles in the production process and economic development and social humanity. This work aims to develop tools from natural products for the enhancement of intellectual training linked to scientific knowledge and aims to develop methods to simplify the chemistry teaching complex pair high school. Executed during part of the school year 2015 distributed in class when needed the extraction of pigments from Hibiscus rosasinensis flowers (hibiscus) and chinensis Ixora (ixora), was presented as a great teaching tool, starting from the selective collection to the satisfactory results of the tests as natural acid-base indicators, with easy and effective methodology. Thus, the pigments obtained from extracts of flowers could be used to determine the acidity and alkalinity of solutions and as a great educational tool for chemistry teaching and learning for high school in the State School of Professional Education Salaberga Torquato Gomes de Matos.