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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 8, Number 1
February 20, 1964 

A Study of the Surface Tension of Some Electrolytic Solutions

몇가지 전해질용액의 표면장력에 관한 연구
Yull Sakong, Jung-Euy Hwang, Moo-Yong Son

사공열, 황정의, 손무용
Relative surface tensions of aqueous solutions of KCl, KI and NaI have been measured at 25℃ (30℃ for KCl) over a concentration range of 0.0001 to 3M solution. It was observed that there was a minimum in the surface tension-concentration curve for the extremely dilute solutions. Appearance of the minimum has been reported for the other salt solutions so far reported. At moderate and high concentration, these three salts increase the surface tension of water almost linearly as concentration increased, and behaved as a typical "capillary inactive substance", whereas they acted as a capillary active substance in very dilute solutions. Since the Onsager-Samaras equation for the surface tension as a function did not agree with the experimental data, the following empirical equations for the whole concentration range used were obtained. σr = 1 + 0.00072√c - 0.0011c + 0.023c2 for KCl at 30℃ σr = 1 + 0.0077√c - 0.0015c + 0.024c2 for KI at 25℃ σr = 1 + 0.00011√c - 0.0090c + 0.077c2 for NaI at 25℃
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