Abstract
Activity coefficients of [Co(en)3](NO3)3 and [Co(en)3](ClO4)3, to be compared with [Co(en)3]Cl3 and the corresponding lanthanum salts previously studied, are determined. [Co(en)3]Cl3 data are revised. Ion interaction strengths vary in the same order found for La3+, i.e., as if nitrate and perchlorate ions were of smaller and larger size, respectively, than chloride ions; however, the differences are much smaller than in lanthanum salts. Tris(ethylenediamine)cobalt III and lanthanum nitrate, chloride, and perchlorate—like the corresponding hexacyanoferrate(III) and hexacyanocobaltate(III) salts, but contrary to sulfate salts—behave as if [Co(en)3]3+ were smaller in size than La3+. In the dilute regions, [Co(en)3](NO3)3 displays negative deviations from the limiting slope, a kind of behavior typical for 2:2, 2:3, 3:2, and 3:3 electrolytes, but unnoticed earlier for 3:1 or 1:3 electrolytes. Pitzer's equation parameters able to provide accurate activity and osmotic coefficients for [Co(en)3](NO3)3, [Co(en)3](ClO4)3, and, revised, [Co(en)3]Cl3 are reported.
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Malatesta, F. Activity and Osmotic Coefficients from the Emf of Liquid Membrane Cells. X. Tris(Ethylenediamine) Cobalt(III) Nitrate, Perchlorate, and Chloride. Journal of Solution Chemistry 31, 547–558 (2002). https://doi.org/10.1023/A:1020241612674
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DOI: https://doi.org/10.1023/A:1020241612674