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Students' Guide in Quantitative Analysis; Intended as an Aid to the Study of Fresenius' System

Students' Guide in Quantitative Analysis; Intended as an Aid to the Study of Fresenius' System


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 Excerpt: ... a known weight (two or three grammes) of chemically pure precipitated silica which has been strongly ignited just before weighing. The amount of silica added is afterwards deducted from the total amount found in Residue d. Note 3. Removal Of The Fused Mass.--Let the crucible cool until just below red heat, then chill it suddenly by plunging it into cold water contained in a porcelain casserole, lay the crucible on its side and digest with boiling water. The fused mass will generally become detached from the crucible and come out in a cake. Then remove the crucible, wash it, treat in a small beaker with a little conc. HCl to remove any adhering particles of the mass, and add this solution to that of the Insoluble Res1due (2). Should any portion of the fused mass, thicker than a film, obstinately resist solution in the hot water, it ought to be removed only by patience and long boiling; and no attempt should be made either to dig it out or to dissolve it in HCl; lest by the formation of Aqua Regia or free CI (in the-presence of NaN03, or Mn203) the crucible be attacked and injured. Note 5. Separat1on Of Si02.--In order to render the Si0a entirely insoluble, it must be perfectly dehydrated. The evaporation should be carried to dryness, the residue heated until odors of HCl can no longer be detected, and the mass is hard and crumbly. Since the residue is to be re-fused with Residue b, the drying may be completed, at a temperature somewhat higher than 100 C, in an air-bath. Note 8. Prec1p1tat1on Of BaS04.--Avoid the addition of a large excess of BaCL, solution. Add only 5 c.c. at first, and then after complete subsidence of precipitate, add a few drops to determine if any H2S04 remains unprecipitated, etc. Then proceed as in Fres., 132, I, 1. After decan...


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Product Details
  • ISBN-13: 9781159673468
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1159673462
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 73 gr


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Students' Guide in Quantitative Analysis; Intended as an Aid to the Study of Fresenius' System
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