334 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



from electromotive force determinations. 15 * It is evident that the 

 activity coefficients, as determined by the two methods, are in remark- 

 ably good agreement. This indicates the correctness of the methods em- 

 ployed in the calculations, as well as the accuracy of the experimental 

 data. Similar calculations have been made for aqueous solutions of 



0.5 1.0 1.5 



Square Root of Concentration. 



2.0 



2,5 



FIG. 59. 



Activity Coefficients of Sodium Chloride Solutions as a Function of 

 Concentration. 



sulphuric acid by the freezing point, electromotive force, and vapor pres- 

 sure methods. Here, again, the results of the different methods have 

 been found to be in excellent agreement. In Table CXXXI are given 

 values of the activity coefficients of typical electrolytes at higher con- 

 centrations. 



TABLE CXXXI. 



ACTIVITY COEFFICIENTS OF TYPICAL ELECTROLYTES. 



C= 0.01 0.02 0.05 0.1 



HC1(25) .... 0.924 

 LiCl(25) .... 0.922 

 NaCl(25) :.. 0.922 



KC1(25) 0.922 



KOH(25) ... 0.92 



KN0 3 0.916 



AgN0 3 0.902 



KI0 3 , NaI0 3 .. 0.882 



BaCl 2 0.716 



CdCl 2 (25) ... 0.532 



K 2 S0 4 0.687 



H 2 S0 4 (25) ... 0.617 

 La(N0 3 ) 3 .... 0.571 



MgS0 4 0.404 



CdS0 4 0.404 



CuS0 4 0.404 



0.2 



0.783 



0.774 



0.752 



0.749 



0.75 



0.5 



0.762 



0.754 



0.689 



0.682 



0.73 



1 



0.823 

 0.776 

 0.650 

 0.634 

 0.75 



3 



1.35 

 1.20 

 0.704 



0.655 0.526 0.396 



0.244 

 0.271 

 0.119 



0.178 0.150 1.70 



0.110 0.067 



and Polack, Jour. Chem. 800. U5 t 1020 (1919), 



