336 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



C , which is termed the ionic strength, is employed to express the activity 



coefficient of a salt in a mixture in terms of a single variable. From their 

 results they conclude that "in dilute solutions the activity coefficient of 

 a given strong electrolyte is the same in all solutions of the same ionic 

 strength." 



75 



70 



65 



CO 



55 



50 



45 



40 



TIC1 



o KNO 3 



n KC1 



x HCI 



o TIN0 3 



o Ba Cf 2 



<? T1 2 S0 4 



6 K 2 S0 4 



0.0 0.1 0.2 0.3 0.4 



Square Root of Ionic Strength, C 



0.5 



0.6 



FIG. 60. Variation of l/C r for Thallous Chloride as a Function of the Ionic 



Strength, C%. 



In Figure 60 are represented values of the reciprocal of the mean 

 molality of thallous chloride, defined according to Equation 115, against 

 values of the square root of C , defined according to Equation 119. In 



Table CXXXII are given values of the activity coefficients of thallous 

 chloride as determined from solubility experiments. 



