Exercises in Quantitative Chemical Analysis; With a Short Treatise on Gas Anakysis ...

Exercises in Quantitative Chemical Analysis; With a Short Treatise on Gas Anakysis ...

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 edition. Excerpt: ...the rate of volatilization of the liquid. A couple of screens should be kept ready to be applied when and where necessary. Sometimes it is expedient to distribute the liquid in two bulbs separated by a column of oxide of copper. Erdmann and Marchand long ago introduced a refinement upon this method, which consists in this, that the bulb is filled almost completely, so that only a part of the tail, Fig. 36. which should be capillary, is left empty, and introduced in the sealed-up condition. After the front oxide and some of the close end have been brought up to redness, the bulb is made to burst by temporary and local application of heat. The respective part of the combustion tube should not lie in a gutter, but be freely suspended to admit of prompt alteration of temperature. The bulb, of course, must be almost absolutely full of liquid, so that it is burst by the steady expansion of the liquid, and not exploded by vapour-pressure. The modification certainly is an improvement, but requires considerable experimental ability for its successful application. The combustion tube at its closed end is provided with a bayonet point, so that when all the vapour is burned, air can be driven through the tube to clear it of carbonic acid and water; or oxygen, to burn away any deposited carbon, if the liquid is richly carboniferous. Ex. 46.--Analysis of Nitrogenous Substances. In the combustion of a nitrogenous substance with oxygen or oxide of copper, part of the nitrogen is converted into N0, which in its turn (in oxygen) passes into N204, which latter goes, part into the water of the chloride of calcium tube, part into the potash-bulb, and makes the weight of both too high. To avoid this error, place a closely-packed spiral of copper gauze in the...show more

Product details

  • Paperback | 102 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123693427X
  • 9781236934277