Colloid and Polymer Science

, Volume 282, Issue 10, pp 1133–1139 | Cite as

Apparent molar quantities of sodium octanoate in aqueous solutions

  • Alfredo González-Pérez
  • Juan M. Ruso
  • Gerardo Prieto
  • Félix Sarmiento
Original Contribution

Abstract

Densities and sound velocities of aqueous solutions of sodium octanoate were determined in a range of molalities between 0.0352 and 0.8105 mol kg−1 at 25, 30, 35, 40 and 45 °C. The isotherms of molality dependence of both density and sound velocity were used to determine the cmcs. Apparent molar volumes and compressibilities were determined from measurements of ultrasound velocity and density. The values of apparent molar volumes and compressibilities at infinite dilution and the apparent molar quantities in the micellar range were obtained and studied as a function of temperature. Values of the critical micelle concentration and the apparent molar quantities in the premicellar and postmicellar range are discussed and compared with the values of the corresponding fluorinated compound.

Keywords

Sodium octanoate Apparent molar volumes Compressibilities Critical micelle concentration Sodium perfluorooctanoate 

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Alfredo González-Pérez
    • 1
  • Juan M. Ruso
    • 1
  • Gerardo Prieto
    • 1
  • Félix Sarmiento
    • 1
  1. 1.Group of Biophysics and Interfaces, Department of Applied Physics, Faculty of PhysicsUniversity of Santiago de CompostelaSantiago de CompostelaSpain

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