The ionization of trichloroacetic acid and evidence for an unusual type of ion pairing |
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Authors: | O D Bonner Paul R Prichard |
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Institution: | (1) Department of Chemistry, University of South Carolina, 29208 Columbia, South Carolina |
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Abstract: | Osmotic and activity coefficients are reported for aqueous solutions of the lithium and potassium salts of iodic acid and
trichloroacetic acid. The degree of ionization of the parent acids at various concentrations was estimated from ion exchange
measurements, and these values were compared with those obtained from Raman measurements. It was concluded that one obtains
comparable values of α, the degree of dissociation, of iodic acid whether these are estimated from hydrogen ion concentrations
or anion concentrations. Lack of agreement between like measurements of α for trichloroacetic acid leads to the postulation
of an unusual ion pair in which the proton is strongly associated with the chlorine end of the anion. A similar type of ion
pairing is suggested in solutions of the aromatic sulfonic acids. |
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Keywords: | Ionization constant ion pairing activity coefficient ion exchange |
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