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Journal of Solution Chemistry

, Volume 13, Issue 6, pp 419–430 | Cite as

Thermal diffusion of alkali bromides

  • Christian J. Petit
  • Jeong-long Lin
  • Kara E. Renner
Article

Abstract

The molar entropies (or heats) of transport of dilute aqueous alkali bromide solutions have been measured by the potentiometric method using the silver, silver bromide thermocell at a mean temperature of 25°C and over a concentration range of 5×10−4 to 0.1M. Experimental results were extrapolated to infinite dilution to obtain the standard molar entropies of transport. The limiting behavior observed is compared with theory based on the electrostatic model.

The standard transported entropy of Br was also derived by extrapolating the steady-state thermoelectric powers to infinite dilution. The ‘absolute’ ionic entropies of transport of alkali metal ions have been estimated based on Gurney's scale. The results obtained are compared with that derived f1/om the previous work on alkali chlorides.

Key words

Thermal diffusion Soret effect heat of transport entropy of transport electrolyte solution non-equilibrium thermodynamics 

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Copyright information

© Plenum Publishing Corporation 1984

Authors and Affiliations

  • Christian J. Petit
    • 1
  • Jeong-long Lin
    • 1
  • Kara E. Renner
    • 1
  1. 1.Department of ChemistryBoston CollegeChestnut Hill

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