Abstract
In this communication an investigation is reported in which ion-pair formation is sensed quantitatively by the laser-Raman technique using as the model electrolyte system solutions of AgNO 3 in acetonitrile. The measurements were extended to the dilute-solution range in an attempt to intercompare the results forK a with those calculated from conductance studies and the Fuoss-Onsager theory of conductance. The highest dilution attained in the spectroscopic studies was in the region of 10⩼−3 M. In the region of concentration overlap, it is found that the values forK a from the present laser-Raman studies and from the Fuoss-Onsager theory of conductance are, respectively, 84±14 and 70.3±1.2; corresponding values for the ion-size parametera j fall in the range of 3.1–4.0 Å. The latter are examined relative to the predictions spectroscopically for contact-ion pair formation at these high dilutions.
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Janz, G.J., Müller, M.A. Ionic association: A laser-raman study in the fuoss-onsager dilute-solution range. J Solution Chem 4, 285–298 (1975). https://doi.org/10.1007/BF00650387
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DOI: https://doi.org/10.1007/BF00650387