Activity and Osmotic Coefficients from the Emf of Liquid Membrane Cells. VIII. K.3[Co(CN)6], Mg3[Co(CN)6]2, and Ca3[Co(CN)6]2 |
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| Authors: | Francesco Malatesta Franco Bruni Nicolangelo Fanelli Sara Trombella Roberto Zamboni |
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| Affiliation: | (1) Dipartimento di Chimica e Chimica Industriale dell', Università di Pisa, Visa Risorgimento 35, 56126 Pisa, Italy;(2) Istituto di Chimica Analitica Strumentale de, CNR, Via Risorgimento 35, 56126 Pisa, Italy |
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| Abstract: | The activity coefficients of K3[Co(CN)6], Mg3[Co(CN)6]2, and Ca3[Co(CN)6]2,are examined. The results highlight close similarity with the correspondinghexacyanoferrate (III) salts. On dilution, K3[Co(CN)6], like K3[Fe(CN)6], approachesthe limiting law from the upper side, while Mg3[Co(CN)6]2 and Ca3[Co(CN)6]2tend to the limiting law from the opposite side, like Mg3[Fe(CN)6]2,Ca3[Fe(CN)6]2, Sr3[Fe(CN)6]2, and Ba3[Fe(CN)6]2. Both kinds of behavior agreewith theory for a model of hard spheres bearing electric charges +1 and –3 or+2 and –3, respectively. The paramater values of the Pitzer equation for activityand osmotic coefficients are reported. |
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| Keywords: | Activity coefficients osmotic coefficients aqueous solution electrolytes liquid membranes membrane electrodes multicharged electrolytes hexacyanocobaltate (III) salts |
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