Studies in the Physical Sciences and Mathematics Volume 1-2

Studies in the Physical Sciences and Mathematics Volume 1-2

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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: ... gm. of this aqueous solution was now added to the alcoholic solution. The salt content of course remained unchanged, the composition of the solvent was now: water 48.28 per cent, alcohol 51.72 per cent, and the critical solution temperatures 34.5 and 50.9. By accident, a little more of the water solution than was intended was now added (1.218 gm.) and the solvent in the resulting solution had the composition: water 48.87 and alcohol 51.13 per cent. On heating and cooling, the solution appeared to be homogeneous except for a trace of cloudiness noticed between 40 and 45. More carbonate, in the form of a solution of known strength, was now added, and the solution cooled to about-12 C., remaining cloudy all the time after the carbonate was added. Water at room temperature was added in small portions, and of course warmed the solution somewhat at each addition; after which it was again cooled. The purpose was to get a solution having a lower critical point at as low a temperature as possible, and take a series of critical temperatures, by adding small portions of water. During the addition of one portion of water, it was noticed that a part of the solution cleared up, but clouded again on cooling. Suspecting the presence of a critical temperature, when further cooling did not clear this, it was allowed to warm up a little, when it was found to clear sharply at exactly--10. Cooling below this produced copious cloudiness, and just at this point it would clear sharply. Careful observation failed to show any trace of crystallization or precipitation of a solid phase, the solution had the same appearance as at other times when at a critical solution temperature. This appeared to be then an upper critical solution temperature, at----10. On warming...show more

Product details

  • Paperback | 38 pages
  • 189 x 246 x 2mm | 86g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236888510
  • 9781236888518