Practical Laboratory Course in Medical Chemistry

Practical Laboratory Course in Medical Chemistry

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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 edition. Excerpt: ... of organic material. The ash is to be examined according to 107. Fourth.--The permanganate test.--Place a measured portion of the concentrated water in a large test-tube, and the latter on a sheet of white paper. Add to the water one-sixth its bulk of strong H.SO, . From a burette add solution of potassium per-manganate of known strength. The solution is decolorized if nitrogenized organic matter is present. When the permanganate is no longer decolorized, as may be determined by looking down-ward through the fluid at the white paper, the amount used is to be read off, whence the comparative proportion of organic matter in the water may be estimated. Fifth.--Test for nitrites.--These are found in water containing decomposing nitrogenized matter. Add to the concentrated water a few drops of dilute pure H.SO, then a little weak solution of iodide of potassium, and, fiuaUy, some starch mucilage. The deep blue iodide of starch is at once formed if nitrites are present. Nitrates do not act in this manner. Sixth.--On adding NesslerEs reagent to water containing ex-ceedingly minute traces of ammonia, a yellow to a red coloration is produced. One part of ammonia in many millions of water may thus be detected. The reaction is as follows: NH, +, HgI, +, KHO = NHgJ +, KI +, HaO. NeuterEs reagent. This is prepared by dissolving,0 or 40 grammes of KI in a little hot water, adding strong hot solution of mercuric chloride, till the red mercurm iodide Oases to redissolve by heat and stirring, dilute, lilter, add, -grammes of caustic potash, and make up to one litre with water; about, c.c. of strong solution of mercuric chloride are added, the liquid set aside till it becomes clear, when it is decanted for use. INORGANIC IMPERITIES IN SO2ETION. 100. While perfecshow more

Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236577698
  • 9781236577696