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Introduction to the Rarer Elements

Introduction to the Rarer Elements


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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. 1908 Excerpt: ...oxyfluoride crystallizes in plates on concentration of the solution. The salts of the two elements should be purified as far as possible by fractional crystallizations. Experiment 2. Preparation of niobic and tantalic oxides (acids), (Nb205; Ta205). (a) Evaporate a solution of potassium and niobium oxyfluoride to dryness, add strong sulphuric acid, and heat until all the hydrofluoric acid is expelled and a solution is obtained. Cool the solution, dilute with water, and boil. Niobic acid, (Nbj0j), is precipitated. Filter, and test the filtrate with ammonium hydroxide. (b) Repeat the experiment, using a solution of potassium and tantalum fluoride instead of the niobium salt. (c) Test the action of alkali hydroxides or carbonates in excess upon solutions of niobium and tantalum obtained in (a) and (b). Experiment 3. Action of fusion with sodium or potassium hydroxide upon niobic and tantalic acids, (a) Melt a gram of sodium or potassium hydroxide in a hard glass tube, add a small quantity of dry niobic acid, and heat again. Note that the fused mass is soluble in water. (b) Repeat the experiment, using dry tantalic acid instead of niobic. (c) Acidify portions of the solutions obtained in (a) and (b). Experiment 4. Color tests for niobium, (a) To separate portions of dry niobic oxide (or acid) add a few drops of strong sulphuric acid, and treat with tannic acid, pyrogallic acid, and morphia, respectively. Note the brown color. (6) Repeat the experiment, using tantalic oxide instead of niobic. Note the absence of color. (c) Try the action of metallic zinc upon an acid solution containing niobium. Experiment 5. Negative tests of niobium and tantalum. Note that hydrogen sulphide gives no precipitate, and that hydrogen peroxide gives no yellow color with acid soluti...


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Product Details
  • ISBN-13: 9781459087477
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 66
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 145908747X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 136 gr


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