Colors and numbers: natural extracts as pH indicators
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Abstract
A pH-indicator obtained from mixtures of natural pigments extracts is presented as an economically feasible and environmentally friendly laboratory activity. Optimal mixtures, with well-defined pH-ranges and colors for acid, neutral and basic media were observed. The work is presented as a hand-on activity that links qualitative & quantitative analysis, and it is proposed as an efficient tool for covering several basics from curriculum, such as extraction processes, colorimetry, data & statistics, natural indicators, and pH.
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References
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