Summary
An indirect iodometric method has been developed for the determination of AgCl, AgBr, AgI, PbCl2, PbBr2, PbI2, PbSO4 and HgI2. The method does not require a prior dissolution of the sample. It is based on the exchange reaction between the insoluble salt and hydrogen sulphide, which yields a strong acid corresponding to the anion of the salt and in amount equivalent to the cation. The liberated acid is determined iodometrically. The method is simple, rapid and accurate.
Zusammenfassung
Eine indirekte jodometrische Methode zur Bestimmung von AgCl, AgBr, AgJ, PbCl2, PbBr2, PbJ2, PbSO4 und HgJ2 wurde ausgearbeitet. Die Probe muß dazu nicht gelöst werden. Die Bestimmung beruht auf der Austauschreaktion zwischen dem unlöslichen Salz und Schwefelwasserstoff, die zur Freisetzung der dem Anion entsprechenden starken Säure in äquivalenter Menge führt. Diese wird jodometrisch titriert.
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Reference
A. I. Vogel, “A Text-Book of Quantitative Inorganic Analysis”, 3rd Ed., London: Longmans. p. 1107.
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In memoriam Professor Cecil L. Wilson.
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Shahine, S., El-Shahat, M.F. & Ismael, N. Iodometric microdetermination of some insoluble salts of silver, lead and mercury(II). Mikrochim Acta 65, 465–468 (1976). https://doi.org/10.1007/BF01218278
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DOI: https://doi.org/10.1007/BF01218278