Fundamental Principles and Their Application

Fundamental Principles and Their Application

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ... but even faintly yellow, the bromine or iodine has not been completely expelled. The treatment with acetic acid and minium or lead dioxide is continued and repeated until a pure white precipitate results. 5. Iodide, bromide and chloride ions may be detected in the presence of one another also by the following method," based, like the one given in 4, on the fact that iodide-ion is most easily oxidized (to iodine), that bromide-ion is less readily oxidized (to bromine) and that chloride-ion resists oxidation most strongly (Chapter 1 In the presence of organic matter, carbon disulphide is used in place of chloroform. 2 A fairly sensitive test may be obtained with filter paper and potassium iodide solution (without starch). ' W. A. Noyes, Qualitative Analysis (1905), p. 74, recommends this method. XIV). Prepare a mixture of a drop each of potassium iodide, bromide and chloride solutions, and dilute the mixture with 2 or 3 c.c. of water. (a) Acidify the solution with 5 c.c. of sulphuric acid and add a few drops of ferric sulphate solution. Add a few particles of pumice stone to the mixture and boil the solution vigorously in a small flask or large test tube; test the vapor for iodine with starch paper. If iodine is found, boil the mixture until all the iodine is removed, adding a drop of the ferric sulphate solution, as needed, to insure the presence of an excess of the oxidizing agent. (b) When the iodine is completely removed, add a few drops of potassium dichromate solution to the mixture, boil it again, and test the vapor for bromine with the aid of potassium iodide starch paper (prepared as in 4 (c)). (c) If bromine is found, boil the liquid until the test paper shows that bromine has been completely expelled; add a drop or two of...
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Product details

  • Paperback | 54 pages
  • 189 x 246 x 3mm | 113g
  • United States
  • English
  • black & white illustrations
  • 1236836944
  • 9781236836946