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Theoretical and Experimental Chemistry

, Volume 4, Issue 4, pp 301–304 | Cite as

Comparison of properties of solutions of alkylammonium salts in water and in solvents having low dielectric constants

I. Thermochemistry of aqueous solutions of tetrabutylammonium nitrate at 25‡ C
  • I. V. Kudryavtseva
  • K. P. Mishchenko
  • G. M. Poltoratskii
Article
  • 24 Downloads

Abstract

The integral heats of solution δHm of tetrabutylammonium nitrate in water at 25‡ C have been measured over the concentration range from 0.005 to 12 moles of salt per 1000 g H2O. The integral heats of dilution δH m 0 and the relative partial molar (rpm) enthalpy of the solvent ¯L1 and solute ¯L2 have been calculated. It follows from the data obtained that the salt has a strong ordering effect on the structure of water. A comparison of the thermochemical characteristics of aqueous solutions of tetrabutylammonium bromide, chloride, and nitrate enables us to attribute this high ordering action of the salt on the structure of water to the cation (C4H9)N+. Anions, of which NO 3 is known to be the strongest destructive agent, compensate the effect of the cation on the curves for the relationship ¯L1/T=f(m) which are in the region of large negative values for all three salts. In the concentration region m=3–5 moles of salt per 1000 g H2O, the relationships we obtained and those calculated from data in the literature have extrema. It is proposed that clathrate hydrates of definite composition exist in solution. Generally, the results obtained do not contradict the Frank hydrate model.

Keywords

Chloride Nitrate Aqueous Solution Hydrate Enthalpy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Faraday Press, Inc. 1971

Authors and Affiliations

  • I. V. Kudryavtseva
    • 1
  • K. P. Mishchenko
    • 1
  • G. M. Poltoratskii
    • 1
  1. 1.Leningrad Technological Institute of the Cellulose and Paper IndustryUSSR

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