. Carnegie Institution of Washington publication. 114 CONDUCTIVITY AND VISCOSITY OF SOLUTIONS elation to be driven back. This shifting of the minimum by the slight solubility, however, seems to be clearly manifested only between salts with great difference in solubility in acetone, as is the case with potas- sium sulphocyanate and the rubidium halides. Of the four salts, rubi- dium chloride, iodide, bromide, and nitrate, the solubility in acetone of only the iodide is accurately known, so that these salts could not be com- pared with each other for the relation between solubility and minimum c
. Carnegie Institution of Washington publication. 114 CONDUCTIVITY AND VISCOSITY OF SOLUTIONS elation to be driven back. This shifting of the minimum by the slight solubility, however, seems to be clearly manifested only between salts with great difference in solubility in acetone, as is the case with potas- sium sulphocyanate and the rubidium halides. Of the four salts, rubi- dium chloride, iodide, bromide, and nitrate, the solubility in acetone of only the iodide is accurately known, so that these salts could not be com- pared with each other for the relation between solubility and minimum conductivity. The relative solubilities in water probably do not correspond to the relative solubilities in acetone. The iodide and the nitrate are respec- tively the most soluble and the least soluble in water; but the conduc- tivity minima of these two salts are the farthest from the ordinate, corresponding to 100 per cent acetone (figs. 48 to 51). £• 115 110 100 90 •§ 70 s 60 60 40 N_ 1600 TT. N 75 50 25 0 Percentage acetone FIG. 48.—Conductivity of rubidium iodide in acetone-water at 25°. 100 90 80 -o 70 60 o 50 40 30 N. 1600 N. 800 200 N 50 10 75 50 25 0 Percentage acetone. FIG. 49. — Conductivity of rubidium bromide in acetone-water at 25°. It is not to be expected that the differences in solubility in water of the different rubidium salts would show this relation, because in the dilutions which are sufficiently great to give any minimum at all, these salts are very far from their saturation in water. In the dilutions greater than N/800, that is, where the dissociation approaches com- pleteness, the minima in the conductivity curves are seen to be nearer those of fluidity (figs. 48 and 51). A comparison of the percentage coefficients of fluidity given in tables 34 to 38 with those of conductivity, shows that the two are nearly equal, which is to be expected in the case of a non-solvated Please note that these images are ext
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