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Surface tension, surface excess concentration, enthalpy and entropy of surface formation of aqueous salt solutions

Authors
Journal
Colloids and Surfaces A Physicochemical and Engineering Aspects
0927-7757
Publisher
Elsevier
Publication Date
Volume
417
Identifiers
DOI: 10.1016/j.colsurfa.2012.10.054
Keywords
  • Surface Tension
  • Salts
  • Surface Parameters
  • Surface Excess Concentration
  • Thermodynamics

Abstract

Abstract Surface tensions of aqueous solutions of sodium salts of chloride, bromide and nitrate; potassium salts of chloride, bromide and nitrate; lithium chloride and potassium iodide has been determined experimentally at different concentrations and temperatures ranging from 0.10 to 2.00molkg−1 and 10–30°C, respectively. Concentration and temperature dependence of the surface tension of the selected salts has been studied for further estimation of surface excess concentration, enthalpy and entropy of surface formation. The results show that the surface excess concentration decreases linearly with concentration but remains almost constant with the variations of temperature. Similarly the enthalpy of surface formation was observed to decrease with concentration but remained almost constant with the change in temperature. The entropy of surface formation was found to decrease with concentration in most cases.

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