Ceramics; A Manual for Chemists, Engineers and Manufacturers

Ceramics; A Manual for Chemists, Engineers and Manufacturers

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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. 1921 edition. Excerpt: ...be regulated so as to complete the fusion in from ten to fifteen minutes and keep the contents in a fused state for ten minutes to insure complete fusion of every thing. Allow it to cool, place contents in a porcelain dish, add about 150 c.c. water, stir with a glass rod until the contents are all dissolved. Then place the crucible on a gauze and heat to boiling. It should be kept so for about twenty or twenty-five minutes until the Na2O2 is all decomposed. Filter and wash the filtrate four or five times with hot water. (It is advisable to fuse the residue on the filter paper again with 3 gms. of Na202 to make sure that all the Cr is separated and treated in the same manner as before.) The filtrate will contain the chromium in solution and the residue on the filter paper will contain Fe, Al, Mn, etc. The greater part of the Al went through the filter paper as well as the silica if it was not all volatilized by the hydrofluoric acid treatment. The filtrate is now acidified with acetic acid and allowed to stand on the hot plate for about fifteen minutes; then filtered and washed with hot water. This precipitate is added to the one previously obtained. The chromium, almost pure, is now in the solution, and can be precipitated with barium chloride (BaCb) or with lead acetate (Pb(C2H3O2)23H2O). If BaCl2 is used then the precipitate is barium chromate (BaCrO4) and if lead acetate is used then the precipitate formed is lead chromate (PbCrO4). The precipitate is dried and placed in a weighed porcelain crucible ignited and allowed to cool in desiccator, then weighed. Subtract the weight of the crucible and multiply the result with the factor.45784 if barium chloride were used as a reagent. If lead acetate were used as a reagent then factor 1.56011 is used...
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Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236644468
  • 9781236644466