Mean activity and osmotic coefficients have been determined a t 25' for aqueous solutions of Co(en),( N03)3, Co(pn)a-(ClO,),, K?Co( CN)e and [Co(en),]n(sO&, by isopiestic comparison with potassium chloride solutions. At the concentrations required, these salts do not obey the simple laws for 3-1 or 3-2 types, requiring low values of 6. to represent the data by means of the Debye-Huckel equation. The solubilities of Co(en),( K03)3.H20 and K3Co(CN)6 were determined to be 0.2749 and 1.311 m, respectively. A decided deviation from the Onsager limiting law was observed. The limiting values obtained for the complex ions are in agreement with those found by previous workers.Conductivity measurements were made on solutions of the same four electrolytes.
IntroductionThis paper is a continuation of a program of investigation of the properties of high-charge electrolytes in aqueous solution.2j3 Four additional compounds, tris-(ethylenediamine)-cobalt (111) nitrate, tris-(propylenediamine)-cobalt(II1) perchlorate, potassium hexacyanocobaltate(II1) and tris-(ethylenediamine) -cobalt (I 11) sulfate, have been prepared and studied. The activity coefficients have been determined by isopiestic comparison with potassium chloride. In addition the contributions of high-order terms of the electrophoretic effect to conductivity were calculated as was done by Dye and Spedding4 for the alkaline earth and rare earth salts. Experimental
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