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Theoretical Principles of the Methods of Analytical Chemistry Based Upon Chemical Reactions

Theoretical Principles of the Methods of Analytical Chemistry Based Upon Chemical Reactions


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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. 1910 Excerpt: ...of the temperature, are formed of the pure solvent, Raoult arrived at the following results: For organic substances, the lowering of the freezing point is independent of the nature of the substance dissolved and of the solvent; it is proportional to the concentration and equal to 0.630 for one molecule dissolved in 100 molecules of the solvent. For saline substances in dilute aqueous solutions, the lowering is proportional to the concentration, but has not the same value as cane sugar taken as the unit. Raoult compiled Cryoscopic tables, giving for a large number of substances the proportional lowering i compared to that of sugar. The assumed molecular weights of all of the substances were taken and dissolved in 100 grams of water. If we call A the lowering produced by a solution of a salt, we have. 1 18.3' 18.3 being the lowering produced by sugar. Now, the coefficients i, thus obtained, are practically equal to those that we deduced from isotonic coefficients, as is shown by the following table: It is the same for similar coefficients deduced from the molecular lowering of the vapor tension (boiling point measurements or tonometry). Wullner, in 1858, established the fact that the boiling point of solutions under atmospheric pressure is higher than that of the pure solvent, and the higher the concentration, the greater the rise. Wullner concluded from his experiments that the lowering of the vapor pressure is proportional to the quantity of the dissolved substance in the same weight of the solvent. Raoult verified the. fact, as in the case of freezing points, that the lowering of the vapor tension depends, in general, only on the ratio of the number of dissolved molecules to the number of molecules of the solvent. With aqueous solutions, that is only true ...


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Product Details
  • ISBN-13: 9781152058712
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 70
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1152058711
  • Publisher Date: 16 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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