Thermodynamics of protonation and sodium binding of sulfate in concentrated NaCl and CsCl solutions studied by Raman spectroscopy

Steven Kratsis, Glenn Hefter, Peter M. May, P. Sipos

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The protonation constant (pK a) of SO 4 2-(aq) has been determined at ionic strengths 0.5 M ≤ I ≤ 4.0 M in NaCl and CsCl media at 25°C by using Raman spectroscopy. These data were used to calculate the association constant of the NaSO 4 - (aq) ion pair in CsCl media. The results are in excellent agreement with previous values obtained by other techniques. The pK a was also measured at I = 4 M in both media at temperatures up to 85°C and the associated enthalpy and entropy changes were calculated. However, reliable thermodynamic data for the ion-pairing reaction could not be obtained at higher temperatures probably because of competition from CsSO 4 -(aq).

Original languageEnglish
Pages (from-to)363-367
Number of pages5
JournalAustralian Journal of Chemistry
Volume53
Issue number5
Publication statusPublished - 2000

Fingerprint

Protonation
Sulfates
Raman spectroscopy
Sodium
Thermodynamics
Ions
Ionic strength
Enthalpy
Entropy
Association reactions
Temperature
cesium chloride

Keywords

  • Caesium chloride
  • Enthalpy
  • Entropy
  • Ion pair
  • Protonation
  • Raman spectroscopy
  • Sodium chloride
  • Sulfate

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Thermodynamics of protonation and sodium binding of sulfate in concentrated NaCl and CsCl solutions studied by Raman spectroscopy. / Kratsis, Steven; Hefter, Glenn; May, Peter M.; Sipos, P.

In: Australian Journal of Chemistry, Vol. 53, No. 5, 2000, p. 363-367.

Research output: Contribution to journalArticle

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