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Type: Artigo de periódico
Title: Natural pH indicators: Using paper or solution?
Author: Terci, DBL
Rossi, AV
Abstract: NATURAL pH INDICATORS: USING PAPER OR SOLUTION? In this work. the fruit extracts of Morus nigra - mulberry, Szygium cuminii - jambolao, Vitis vinifera - grape, Myrciaria cauliflora - jabuticaba are suggested as pH indicators in the form of either solutions or paper. The pH indicator solutions were prepared by soaking the fruits or their peels in ethanol 1:3 (m/V) for 24 h, followed by simple filtration. The pH indicator papers were prepared by imersion of the qualitative filter paper strips in the pH indicator solutions. The different pH leads to color changes in the indicator solutions or papers and it can be used for teaching elementary chemistry concepts.
Subject: natural pH indicator
didactic experiment
acid-base equilibrium
Country: Brasil
Editor: Soc Brasileira Quimica
Citation: Quimica Nova. Soc Brasileira Quimica, v. 25, n. 4, n. 684, n. 688, 2002.
Rights: aberto
Identifier DOI: 10.1590/S0100-40422002000400026
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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