Select Methods in Quantitative Analysis; Chiefly Inorganic
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Select Methods in Quantitative Analysis; Chiefly Inorganic

Select Methods in Quantitative Analysis; Chiefly Inorganic


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: hours well corked. Filter rapidly, wash with cold water, place a clean beaker under the funnel, pierce the filter and wash contents into the beaker. Wash the flask and filter with hot dilute HCl, then with hot water, and add washings to the contents of beaker. Dissolve the soluble contents of the beaker in HCl, with a few drops of HNO3 to oxidize ferrous iron, boil and precipitate in the usual manner with NH4OH. Boil three or four minutes, or till the odor of ammonia is gone, allow to subside, filter and wash well with hot water; dry, separate the residue from filter as completely as possible, ignite filter and add to residue. Carefully pulverize this lumpy residue in an agate mortar. In a platinum crucible place 3 to 6 grams of Na, CO3 and y2 gram of KNO3 for steels (for pig irons, from 2 to 3 grams of KNO3 are necessary), add residue, and mix thoroughly. Gradually heat to fusion, until KNO3 is decomposed; cool, dissolve in hot water, filter and wash well with hot water, make acid with HCl and boil; add a little sodium sulphite, boil two or three minutes, and precipitate with NH4OH; finally boiling for a few minutes more. Filter, wash well, dissolve in HCl, evaporate to dry- ness to separate silica; cool, take up in HCl, dilute, filter off silica, and precipitate Cr2O3 with NH4OH. Filter, wash well, dry, ignite and weigh. The precipitate may contain small amounts of alumina and phosphoric acid. Mr. Textor advises a second fusion of the oxides from the first precipitation with ammonia. Determination of Titanium. Steels rarely carry more than a trace of titanium, but notable quantities exist in some pig irons. Dissolve from 5 to 10 grams of the pig iron in Silicon Mixture (Reagent 15), and evaporate till fumes of SO3 come off in large quantity, using about 20 cc. of the mix..


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Product Details
  • ISBN-13: 9780217868044
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 72
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 0217868045
  • Publisher Date: 08 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 145 gr


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