262 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



difference is in general much smaller than in the case of solutions of non- 

 electrolytes. 



It is not possible to determine the concentration of the un-ionized 

 fraction in mixtures of electrolytes without assuming a law governing 



0-014 



0.0*0 



^ 



U 



o.on 



TICI 



o.oo o.oz 00+ o.oe 0.O8 0,10 o./z a. /-f- o ./f 

 Concentration of Added Salt in Equivalents per Liter. 



FIG. 51. Solubility of Thallous Chloride in Water in the Presence of Other 



Electrolytes. 



the ionization of electrolytes in mixtures. As a rule, the iso-ionic prin- 

 ciple has been employed for this purpose. In Table CIV are given values 

 for the concentration of the un-ionized fraction, T1C1, and the ion product, 

 Tl + X Cl~, for solutions of thallous chloride in the presence of different 

 electrolytes at 25 24 , the isohydric principle being assumed to hold for 



the mixtures. 



TABLE CIV. 



CALCULATED VALUES OF THE ION PRODUCT AND THE CONCENTRATION OF 



THE UN-IONIZED FRACTION FOR THALLOUS CHLORIDE IN WATER 



AT 25 IN THE PRESENCE OF DIFFERENT ELECTROLYTES. 



Cone. 20 25 



(T1C1 1.755 1.338 



JTl+XCl- .... 204.9 211.0 



JT1C1 1.755 1.465 



(T1+XC1- .... 204.9 208.1 



JT1C1 1.755 1.343 



(T1 + XC1- .... 204.9 217.4 



Cone. 20 25 



JT1C1 1.755 .. 1.390 



(T1+XC1- .... 204.9 .. 218.1 



2 * Bray and Winninghoff, loc. cit. 



Added Salt 

 1/2 K 2 S0 4 



1/2T1 2 S0 4 

 KN0 3 



KC1 



