FORM OF THE CONDUCTANCE FUNCTION 107 



is to be borne in mind that the value of A for this electrolyte is much 

 less certain than that for the uni-univalent salts. 



TABLE XXXVI. 



VALUE OF THE MASS- ACTION FUNCTION FOR CuS0 4 IN H 2 AT 18. 



C ..... 10- 3 5X10' 3 2X10' 2 lO' 1 1.0 



y%.... 86.2 70.9 55.0 39.6 30.9 



K ..... 5.4X10' 3 8.6X10- 3 1.34X10' 2 2.6X10' 2 1.38X10" 1 



As the salts become more complex, the value of the mass-action func- 

 tion becomes smaller and decreases more rapidly as the concentration 

 decreases. For potassium ferrocyanide, assuming the reaction equation: 



K 4 FeCN 6 = 4K + + FeCN 6 ~~, 

 the mass-action function has the form: 



CU-Y) 



Values of the function at different concentrations are given in Table 

 XXXVII for this salt, as well as for lanthanum sulphate. The constant 

 for the ferrocyanide is throughout small and at low concentrations 

 approaches values of an entirely different order of magnitude from that 

 at the higher concentrations. In the case of lanthanum sulphate, the 

 change in the constant is even more pronounced, as may be seen from 

 an inspection of the table. 



TABLE XXXVII. 



VALUES OF THE MASS- ACTION FUNCTION OF AQUEOUS SALT SOLUTIONS. 



K 4 FeCN 6 



C 2X10- 3 1.25X10' 2 5.0X10' 2 1.0X10' 1 3.0X10' 1 4.0X10' 1 

 y% 85.8 71.0 68.7 53.2 48.8 45.3 



K .52X10' 10 1.5X10 8 1.03X10- 6 0.920X10' 5 4.33X10' 4 0.925X10' 3 



La 2 (S0 4 ) 3 



C ........... 2X10' 3 10' 2 5X10' 2 



Y% ......... 51.4 33.9 26.2 



K .......... 1.28X10' 12 0.67X10- 10 1.03X10' 8 



It is obvious that, in solutions of electrolytes of higher type, the 

 mass-action function varies the more the higher the type of the salt. 

 The value which the function appears to approach at very low concen- 



