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SODIUM CHLORIDE SOLUTIONS AS AN ISOPIESTIC STANDARD |
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Canadian Journal of Research,
Volume 17b,
Issue 8,
1939,
Page 215-230
A. A. Janis,
J. B. Ferguson,
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摘要:
A method is described for the accurate determination of the vapour pressure of aqueous solutions of non-volatile salts. Solutions of two salts contained in a large silver dish are rocked in an evacuated desiccator until equilibrium is attained, then the vapour pressure of the one solution is determined from the known vapour pressure of the other. Results on the rate of attainment of equilibrium are given for various types of containers.Sodium chloride is chosen as the standard. Results are given for the system sodium-chloride–potassium-chloride at 25 °C., 30 °C., and 35 °C. Since there is a disagreement amongst the results for sodium chloride calculated from e.m.f. data and those determined from direct vapour pressure data, an arbitrarily selected vapour pressure curve is adopted. This curve is found to yield the activity coefficients of potassium chloride remarkably well. The method yields results whose accuracy is comparable with that of the best e.m.f. measurements.
ISSN:1923-4287
DOI:10.1139/cjr39b-032
出版商:NRC Research Press
年代:1939
数据来源: NRC
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THE EFFECT OF COMPRESSION ON THE HOMOGENEOUS SYSTEMS ETHYLENE AND AIR-ETHYLENE IN THE CRITICAL REGION |
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Canadian Journal of Research,
Volume 17b,
Issue 8,
1939,
Page 231-240
O. Maass,
R. L. McIntosh,
J. R. Dacey,
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PDF (535KB)
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摘要:
The effect of compression, due to the thermal expansion, on the density of the systems ethylene and air-ethylene in the critical region has been studied. Apparently stable heterogeneous systems, as detected by density measurements, are re-formed by this treatment. The significance of these experiments in relation to critical phenomena is discussed, and an explanation based on a concept of the mutual dispersion of the two phases is suggested.
ISSN:1923-4287
DOI:10.1139/cjr39b-033
出版商:NRC Research Press
年代:1939
数据来源: NRC
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