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Adsorption of 4-nitrophenol onto Amberlite IRA-900 modified with metallophthalocyanines

Eloïse Marais1, Tebello Nyokong

  • 1Department of Chemistry, Rhodes University, P.O. Box 94, 6140 Grahamstown, South Africa.

Journal of Hazardous Materials
|August 8, 2007
PubMed

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Precipitation Titration: Endpoint Detection Methods01:19

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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...