Journal of Solution Chemistry

, Volume 26, Issue 10, pp 957–972 | Cite as

Protonation and sodium ion-pairing of the sulfite ion in concentrated aqueous electrolyte solutions

  • S. G. Capewell
  • G. T. Hefter
  • P. Sipos
  • P. M. May
Article

Abstract

A protocol has been developed for the reliable titration of aqueous sulfite solutions which minimizes photodecomposition effects. This procedure has been used to measure the protonation constants of the sulfite ion in aqueous solution by glass electrode potentiometry at 25.0‡C and ionic strengths (I) from 0.1 to 5.0M in NaCI media and atI = 1.0M in KC1 and Me4NCl media. These measurements provided evidence of weak but significant ionpairing between SO2/3 -and Na+ with a formation constant of logKNa = 0.431 in 1.0M Me4NCl. This was in very good agreement with the value logKNa = 0.410 measured directly by Na+ ion-selective electrode potentiometry. Evidence is also presented for an extremely weak association of K+ and SO23-with logKk= 0.22 in 1.0M Me4NCl.

Key Words

Potentiometry sulfite protonation constant sodium ion potassium ion ion-pairing concentrated electrolytes ion-selective electrode 

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Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • S. G. Capewell
    • 1
  • G. T. Hefter
    • 2
  • P. Sipos
    • 3
  • P. M. May
    • 1
  1. 1.A. J. Parker Cooperative Research Center for HydrometallurgyMurdoch UniversityMurdochAustralia
  2. 2.Department of Chemistry and Mineral Science, Division of ScienceMurdoch UniversityMurdochAustralia
  3. 3.CSIRO Division of MineralsWaterfordAustralia

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