Introduction to Chemical-Technical Analysis

Introduction to Chemical-Technical Analysis

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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. 1898 edition. Excerpt: ...D. On the other hand, by opening the pinchcock/ it may be let out of Cand D into E. Operation.--The normal weight (1.7 grs.) required by the apparatus of the finely-powdered bone black is weighed out and placed in the thoroughly dried flask A. The gutta-percha vessel 5 is then filled with hydrochloric acid of 1.12 density (2 vols. conc. hydrochloric acid, i vol. water) and carefully placed, with forceps, in A, so that it rests on the glass side in a slanting position. After raising the water in C to the zero mark by forcing air into the flask E and simultaneously opening the clip /, A is closed with the well-greased stopper. Fig. 9.--Scheibler's Apparatus. Any air pressure and consequent change in the level of the liquid in C and D are removed by opening the clip q once. The vessel A is taken between thumb and middle finger of the right hand, while the forefinger presses the stopper. The flask is then inclined sufficiently to allow the acid to escape from the gutta-percha holder. Decomposition, which ensues, is sustained and augmented by careful continued shaking of the flask A. Simultaneously the clip/ is opened with the left hand, and as much water is allowed to flow into E as is necessary to bring both levels in tubes C and D to about the same height; that in D somewhat higher than in C. When water in C ceases to descend on prolonged agitation of A, the decomposition is complete. 5-10 minutes are allowed to elapse in order to allow pressure and temperature to equalize, after which the levels in C and D are brought to the same height by carefully opening the clip q. The level in C is read off, as well as the temperature of a thermometer placed in the apparatus. The direct percentage of carbonate of lime is found, by means of these two numbers, ...show more

Product details

  • Paperback | 64 pages
  • 189 x 246 x 3mm | 132g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236672062
  • 9781236672063