A Text-Book of Organic Chemistry for Students of Medicine and Biology C. 2

A Text-Book of Organic Chemistry for Students of Medicine and Biology C. 2

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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. 1916 edition. Excerpt: ...alcohols is known. These alcohols are collectively estimated by repeatedly shaking with petroleum ether the solution of the soaps, glycerol, and higher alcohols obtained in the determination of the saponification number after again making it alkaline after the titration. Petroleum ether does not dissolve soaps, glycerol, or potassium hydroxide, but readily dissolves the higher alcohols in question. After separating the petroleum ether, filtering, and evaporating it, and again taking up the residue of higher alcohols in a fat solvent such as ether, the solution is filtered, and the solvent evaporated in a weighed dish. The residue is weighed after keeping the dish in a desiccator until its weight is constant. This weight represents the higher alcohols which were present in the sample of fat. A few typical values of the higher alcohols in some common fats will illustrate the importance of this determination. Sperm oil 37.0-11.0 Beeswax 52.0-56.0 The Iodine Number.--The relative content of saturated and unsaturated fatty acids in fats is determined by the capacity of the fats to absorb iodine. As an example of the determination of this value, the Hubl method will be described: (1) A standard solution of iodine containing 25 grams of iodine and 30 grams of mercuric chloride dissolved in 500 c.c. of alcohol, free from fusel oil. (2) A solution of sodium thiosulphate containing 24 grams of the salt per liter. This solution is standardized by determining the number of milligrams of iodine which is reduced by a cubic centimeter of the solution. The sample of fat, .3 to.4 gram of olein-rich fats or.8 to 1 gram of solid fats, is weighed into a glass stoppered bottle and dissolved in 15-25 c.c. of chloroform. It is then heated with 25 c.c. of the iodine..show more

Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236603850
  • 9781236603852