Química Nova | |
Aplicação de pigmentos de flores no ensino de química | |
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
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
【 预 览 】
Files | Size | Format | View |
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RO202103040060493ZK.pdf | 4861KB | download |