Proceedings of the Nova Scotian Institute of Science Volume 10, Pts. 2-4

Proceedings of the Nova Scotian Institute of Science Volume 10, Pts. 2-4

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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. 1903 edition. Excerpt: ...tests of Fe., later Potassium Sulphocyanate was found to detect ferric Fe, when the Cynanides failed to do so. This reagent gives to a solution containing ferric Fe. in solution, a blood red or, in weaker solution, a wine color. When, however, some chemist proposed to add ether to the solution after testing for Fe. and failing to obtain a color, he found on closing the test-tube, and shaking violently that from a solution that was colorless after adding KCNS, a red color was extracted by the ether. This of course gives a very dolicate test for Fe., a delicacy unsought for a few years since. The Di. test is probably not so delicate at present. But just here comes in one more of the evil features of the rare earth work, for the test that serves to prove the absence of Di must serve also as the test for La. Which has no absorption bands, since La. being more strongly basic than Di., when the latter is known to be removed the former must have been previously gotten rid of. Of course the spark spectra could be employed, and, unless some easier method is discovered, must be employed in very accurate work, but it is tedious and requires special apparatus and precludes all workers, but those who have the ad vantages Of the finest university laboratories, or are themselves wealthy. It needs, moreover, a much longer training than is needed to use the absorption band method. It is seldom employed as a test. The other method, applicable also in every case, but slow and requiring the very highest chemical skill to ensure results is to make equivalent weight determinations. This has so far been done gravimetrically, but methods are being sought by which it may be done volumetrically, which will be a. great shortening, and in skilled hands, if the...show more

Product details

  • Paperback | 140 pages
  • 189 x 246 x 8mm | 263g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236790634
  • 9781236790637