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Synchronous-derivative phosphorimetric determination of 1- and 2-naphthol in irrigation water by employing

M Hernández López1, M Algarra González, M Isabel López Molina

  • 1Department of Analytical Chemistry, Faculty of Sciences, University of Málaga, Campus de Teatinos s/n, 29071 Malaga, Spain.

Talanta
|October 31, 2008
PubMed

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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...