| Journal: | Quimica nova |
| Database: | PERIÓDICA |
| System number: | 000196327 |
| ISSN: | 0100-4042 |
| Authors: | Soares, Marion Herbert Flora Barbosa1 Cavalheiro, Eder Tadeu Gomes Antunes, Patricia Alexandra |
| Institutions: | 1Universidade Federal de Sao Carlos, Centro de Ciencias Exatas e de Tecnologia, Sao Carlos, Sao Paulo. Brasil 2Universidade de Sao Paulo, Instituto de Quimica de Sao Carlos, Sao Carlos, Sao Paulo. Brasil |
| Year: | 2001 |
| Season: | May-Jun |
| Volumen: | 24 |
| Number: | 3 |
| Pages: | 408-411 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Experimental, divulgación |
| English abstract | Crude extract of Tibouchina granulosa, Rhododendron simsii and Phaseolus vulgaris L. were prepared and used as alternative indicators in quantitative analysis teaching in standardization of NaOH solutions and in the determination of acetic acid contents in vinegar. Effect of using such natural extracts as indicators was very attractive to the students and the quantitative results were compared with conventional indicators with good agreement. Concepts of data statistics can successfully be discussed using the interest revived by the use of natural indicators |
| Disciplines: | Química, Educación |
| Keyword: | Fitoquímica, Química analítica, Educación superior, Tibouchina granulosa, Rhododendron simsii, Phaseolus vulgaris, Extractos naturales, Indicadores naturales, Volumetría |
| Keyword: | Chemistry, Education, Analytical chemistry, Phytochemistry, Higher education, Tibouchina granulosa, Rhododendron simsii, Phaseolus vulgaris, Natural extracts, Natural indicators, Volumetry |
| Full text: | Texto completo (Ver HTML) |
