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Dina T El-Sherbiny1, Dalia R El-Wasseef, Mohammed E Abd El-Ghaffar

  • 1Department of Medicinal Chemistry, University of Mansoura, Mansoura, 35516, Egypt. dina_elsherbiny@yahoo.com

Journal of Fluorescence
|October 9, 2009
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...