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Aplicação de pigmentos de flores no ensino de química

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dc.creator Couto Andréa Boldarini
dc.creator Ramos Luíz Antonio
dc.creator Cavalheiro Éder Tadeu Gomes
dc.date 1998
dc.date.accessioned 2013-05-30T10:54:41Z
dc.date.available 2013-05-30T10:54:41Z
dc.date.issued 2013-05-30
dc.identifier http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000200020
dc.identifier http://www.doaj.org/doaj?func=openurl&genre=article&issn=01004042&date=1998&volume=21&issue=2&spage=221
dc.identifier.uri http://koha.mediu.edu.my:8181/jspui/handle/123456789/4268
dc.description In the present work, the pH dependent colour change of the crude flower extracts is suggested as subject in teaching chemical or acid-base equilibria, visual indicators and some aspects of spectrophotometric concepts and applications. The vegetal species used are commonly found in Brazil, and the extraction methodology proposed is inexpensive and easy to perform in secondary schools and in general chemistry or instrumental undergraduate courses. A bibliographic review about the use of vegetal extracts in chemical education and a discussion of the flower colour are also presented.
dc.publisher Sociedade Brasileira de Química
dc.source Química Nova
dc.subject colour change of crude flower extract
dc.subject acid-base equilibrium
dc.subject spectrophotometry
dc.title Aplicação de pigmentos de flores no ensino de química

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