CROMATOGRAFIA PLANAR: UMA PROPOSTA DE PRÁTICA PARA O ENSINO DE QUÍMICA NO ENSINO MÉDIO.

Abstract

The creation of teaching tools to contextualize theory within the teaching-learning process is extremely necessary for a complete education. In this context, linking practicalexperimental classes becomes a valuable strategy to achieve this teaching to a more effective learning. Thus, this research proposed the creation and execution of an experimental script using Paper Chromatography (CP) and Thin Layer Chromatography (CCD) for the separation of chemical constituents present in food colorings, pen inks and extracts of some vegetables. Both chromatographic techniques were efficient in separating substances based on the difference of polarity and affinity between solvents and sample. The results showed that CP is more efficient, cheaper and easier to implement to achieve the objectives of association between theory and practice in the teaching and learning process of chemistry teaching in high school.