Perchloric acid titrations in an acetic acid medium: indicator evaluation and new screened indicators
- 1 January 1985
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 110 (8) , 981-984
- https://doi.org/10.1039/an9851000981
Abstract
Metformine titrations with perchloric acid in an acetic acid medium have been carried out in order to test several recommended indicators: crystal violet, methyl violet, Tropaeolin OO, bromocresol purple and malachite green; crystal violet and methyl violet were found to be the most suitable. From these studies two mixtures are proposed as screened indicators for improving observation of the end-point: methyl violet-Neozapon yellow-thymol blue and crystal violet-Neozapon yellow-thymol blue. The studies were carried out using tristimulus colorimetry theory.Keywords
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