Bulletin - Bureau of Chemistry Volume 155-166

Bulletin - Bureau of Chemistry Volume 155-166

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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. 1912 edition. Excerpt: ...until the solution becomes homogeneous. Then pour the solution into 700 or 800 cc of hot distilled Water, care being taken to mix the two radually. Heat until perfectly clear. Acidify with dilute hydrochloric acid (1:1 and heat until the fatty acids are entirely clear. Wash, dry and determine the crystallizin point as indicated in Method N 0. 1. As a control on these three metho s, each sample should be run by the oflicial method, usin either water or alcohol, as indicated on page 135 of Bulletin 107, Revised. I wou d su gest that as the amount of sample avai able for these tests is rather small instead o using 75 grams of fat in the official method, half this amount be taken and the quantities of sodium hydroxid, alcohol, water, etc., be reduced proportionately. Some criticisms have been made against the use of glycerol as a saponification medium since the iodin values of the separated acids as obtained by this method differ from those obtained when alcohol or water is used. I shall greatly appreciate it if those of you who have the time to spare will make a determination of the iodin number of each of the fatty acids after the titer has been determined. In order to eliminate as far as possible any discrepancies in the reported results of temperature which might arise from differences in standardization of the titer thermometers or of minor variations in methods of stirring and in judging the cooling point, the samples of oils and fats are accompanied by a small sample of fatty acids which has been made here in my laboratory, and I am asking that each of you report the titer temperature of this sample along with the rest of the results. COOPERATIVE RESULTS ON Furs AND OILS, 1912. The results of this collaborative work are given in the...
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Product details

  • Paperback | 250 pages
  • 189 x 246 x 13mm | 454g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236976304
  • 9781236976307