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Thermodynamic Quantities of Surface Formation of Aqueous Electrolyte Solutions: I. Aqueous Solutions of NaCl, MgCl2, and LaCl3

✍ Scribed by Norihiro Matubayasi; Hideyuki Matsuo; Kazuo Yamamoto; Shin-ichiro Yamaguchi; Asako Matuzawa

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
84 KB
Volume
209
Category
Article
ISSN
0021-9797

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✦ Synopsis

The surface tensions of aqueous solutions of sodium, magnesium, and lanthanum chlorides were measured as a function of concentration and temperature. By analyzing the results, the concentration dependence of the thermodynamic quantities of surface formation such as entropy (⌬s), Helmholtz free energy (⌬ f ), and energy of surface formation (⌬u) were evaluated. The ⌬ f increased almost linearly with increasing concentration, and the degree of the increase is mainly determined by the net charges of the salts. The ⌬s decreased with the addition of salt into the solution. It was found that the net charge of salts determines the degree of the decrease in ⌬s. On the other hand, a slight change in the ⌬u is observed because of the opposite contribution of ⌬f and T⌬s to the ⌬u value.

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