266 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



tion function of the pure electrolyte. The value of 2(7- may be 



calculated by means of Equation 52. From Equation 70, it is evident 

 that the total solubility of the salt S in the presence of another salt with 

 a common ion is a linear function of the reciprocal of the common ion 



concentration ^77-. In Figure 52 are plotted solubility values for T1C1 



0.016 



0.01+ 



O 012 



O-O/O 



0.00* 



0.006 



6.004 



o.o oa 



zo 



30 



70 



Reciprocal of Total Ion Concentration - 



FIG. 52. Representing the Solubility of Thallous Chloride as a Function of the 

 Reciprocal of the Total Ion Concentration. 



in the presence of thallous sulphate, thallous nitrate, potassium chloride 

 and barium chloride. In the case of KC1 as added salt, the values of 

 2C have been calculated according to Equation 52. The other values 



of 2C are those of Bray, 28 which are based on the isohydric principle. 

 Since the difference in the values of 2(7^ as derived by Equations 51 and 

 52 is not great, an approximate comparison is afforded by the values 



"Bray, J. Am. Chem. Soc. S3, 1674 (1911). 



