The titration of silver with potassium iodide. Use of four selected oxidizing agents and starch as indicators
✍ Scribed by Jay H. Quinn; Wallace M. McNabb
- Publisher
- Elsevier Science
- Year
- 1945
- Tongue
- English
- Weight
- 275 KB
- Volume
- 240
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
A method of determining silver by titration with standard potassium iodide in the presence of starch and ceric ions has been described (I, 2, 4, 8, 9). The advantages of this method over the Gay-Lussac and Volhard methods led the authors to investigate its further application; namely, the titration of silver with a standard potassium iodide solution in the presence of four other selected oxidizing agents and starch as indicators. Of the oxidizing agents selected from a table of oxidationreduction potentials, it was found that potassium dichromate, potassium permanganate, potassium bromate, or potassium iodate gave satisfactory results. This method is believed to be applicable to any properly prepared solution of silver free from interfering substances, such as mercury, palladium, or thallous salts.
Titrations were carried out varying the amounts of reagents so as to establish the best conditions for the greatest degree of accuracy. Results were obtained by titrating in the presence of elements sometimes associated with silver to test for possible interference.
REAGENTS.