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

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 (Δs), Helmholtz free energ...

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Bibliographic Details
Published in:Journal of colloid and interface science 1999-01, Vol.209 (2), p.398-402
Main Authors: Matubayasi, Norihiro, Matsuo, Hideyuki, Yamamoto, Kazuo, Yamaguchi, Shin-ichiro, Matuzawa, Asako
Format: Article
Language:English
Subjects:
Chemistry
electrolytes
Exact sciences and technology
Gas-liquid interface and liquid-liquid interface
General and physical chemistry
lanthanum chloride
magnesium chloride
salts
sodium chloride
Solution properties
Solutions
Surface physical chemistry
surface tension
thermodynamics
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Summary: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 (Δs), Helmholtz free energy (Δf), and energy of surface formation (Δu) were evaluated. The Δfincreased almost linearly with increasing concentration, and the degree of the increase is mainly determined by the net charges of the salts. The Δsdecreased with the addition of salt into the solution. It was found that the net charge of salts determines the degree of the decrease in Δs. On the other hand, a slight change in the Δuis observed because of the opposite contribution of ΔfandTΔsto the Δuvalue.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1998.5928