Abstract
Given the various difficulties to expose the contents of the subject of chemistry is a constant search for alternative materials to facilitate learning. This may partly be due to chemical science to be a significant practical character. However, due to professional educational institutions and material limitations ends up being passed on to the student of predominantly theoretical way, requiring a high degree of abstraction and consequently in their disinterest the same. In this context , we investigated the use of ethanol extracts of various plants, such as: Jitirana (Ipomoea glabra ), Íxora (Ixora coccínea), Centro (Centrosema brasilianum) and Candlebush (Senna alata) flowers, Beet (Beta vulgaris L.) fruit and Urucum (Bixa orellana) seeds as an acids and bases natural indicator, from laboratory tests capable of identifying properties demonstrate the pH. Initially we evaluated the variation in the coloration of extracts using for this buffer solutions at pH 3, 7 and 12. Among the cited vegetable flowers Jitirana, ixora and Centro presented activities relevant indicator as staining variants between pH 2:13. The extracts of plants were further added in glass tubes containing buffer solutions with a pH ranging from 2 to 13. The change in color of the extracts showed good activity has the same pH indicator.
Highlights
The lack of interest of the students verified during the classes of the Exact Sciences disciplines and, among those, Chemistry, has been teasing the academic environment about other possibilities to make the student gets involved in the discipline, awakening in them the pleasure of learning
The vegetable species used for this experiment were Jitirana (Ipomoea glabra), Ixora (Ixora coccínea), Centro (Centrosema brasilianum) Candlebush (Senna alata), Beet (Beta vulgaris L.) e o Achiote (Bixa orellana)
According to the outcomes discussed, we can conclude that among the vegetable and flower extracts studied by us, the only ones that have presented the behavior of a natural indicator of pH using solution were the flowers of Jitirana (Ipomoea glabra Choisy), Centro (Centrosema brasilianum) and Ixora (Ixora coccinea)
Summary
The lack of interest of the students verified during the classes of the Exact Sciences disciplines and, among those, Chemistry, has been teasing the academic environment about other possibilities to make the student gets involved in the discipline, awakening in them the pleasure of learning. Being, carrying innovative classes that involve the everyday life of the student is of vital importance for a type of learning that will stimulate observation, reflection, questioning and criticism. In this context, the use of natural products in the teaching of Chemistry has been at the forefront in the field during the last years. The use of natural products in the teaching of Chemistry has been at the forefront in the field during the last years This area of research is important for the discovery of substances that may substitute the toxic and expensive materials used in the routine of practical activities
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