On Automatic Apparatus for Cryoscopy and Improvement in Experimental Method

Cryoscopy 裝置와 方法의 改良에 關한 硏究

  • Shin, Yun-Kyong (Department of Chemical Engineering, College of Engineering, Seoul National University) ;
  • Lee, Joon (Department of Chemical Engineering, College of Engineering, Seoul National University)
  • 신윤경 (서울大學校 工科大學 化學工學科) ;
  • 이준 (서울大學校 工科大學 化學工學科)
  • Published : 1974.04.30

Abstract

The traditional cryoscopic measurement had performed by inconvenient manual operation which accompanies various unavoidable errors. For example, the irregularity of hand stirring, difference of visual angle in reading Beckmann thermometer and furthermore, its large heat capacity acts as the decreasing effect of the sensitivity. In these studies, the author devised new automatically measuring cryoscopic apparatus with temperature recording system in which temperature variation is changed to electric current. The light beam from the galvanometer is absorbed by the photographic paper on the rotating cylinder. On the other hand, the use of sodium sulfate decahydrate in cryoscopy causes considerable error, because small crystal particles adhere on the upper wall of the measuring tube. As an improvement, anhydrous sodium sulfate is used and then the desired amount of water is added.

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References

  1. Helv. Chim Acta v.215 G. Parrissakis;G. Schwarzenbach
  2. Z. f. Elecktrochemie Bd 56 Heft 1 K. F. Jahr;R. Kubens