Aplicação de pigmentos de flores no ensino de química

Química Nova

Andréa Boldarini Couto¹  Luíz Antonio Ramos¹  Éder Tadeu Gomes Cavalheiro¹ 

[1] ,Universidade Federal de São Carlos Departamento de Química São Carlos SP

关键词: colour change of crude flower extract;    acid-base equilibrium;    spectrophotometry;   

DOI  :  10.1590/S0100-40421998000200020

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY-NC   
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