Quickening of Molar Mass Measurement using Dumas Method

IR

Bibliographic Information

Other Title
  • デュマ法によるモル質量測定実験の迅速化

Description

Molar mass measurement using Dumas method is usually taken in high school chemistryprogram or general university chemistry one for first-year students. However, the ordinary methodtakes much time and therefore it is difficult for students to finish it within a limited lesson period.In this paper, the improved Dumas method, which enables them to measure molar mass withrapidity, is proposed and applied for ethanol, 2-propanol, and ethyl acetate. The main improvementis as follows: First, the RTP constant (=RT/P, R : gas constant, P : atmospheric pressure, T :absolute temperature of boiling water) is used for estimating molar mass directly. Second, thevolume correction is omitted because its contribution to molar mass is negligible. And finally, thebuoyancy parameter (BP) is used for correcting the contribution of buoyancy to sample weight, orthe buoyancy correction is omitted because its weight loss is ca 5% of sample weight. It issuggested that the experiment time is shortened and the complicated calculations are simplifiedusing these methods.

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Details 詳細情報について

  • CRID
    1050282677899793408
  • NII Article ID
    120006315636
  • ISSN
    09150935
  • Web Site
    https://uec.repo.nii.ac.jp/records/6907
  • Text Lang
    ja
  • Article Type
    departmental bulletin paper
  • Data Source
    • IRDB
    • CiNii Articles
    • KAKEN

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