SOLUTIONS AS A FUNCTION OF TEMPERATURE 



157 



These constants correspond very nearly with those for solutions of potas- 

 sium iodide in sulphur dioxide. The data for these solutions present 

 certain inconsistencies, particularly at low concentrations, which render 

 it very difficult to determine the precise values of A<>. Accordingly, the 

 approximate constants given above have been adopted for the purpose 

 of illustrating the effect of temperature upon the ionization and con- 

 ductance of an electrolyte. The constant D is assumed to be inde- 

 pendent of temperature. This condition is approximately fulfilled in 

 solvents having dielectric constants lower than 25. The lower curves 



Z25 

 ZOO 

 175 



,00 



75 



50 



45 







00 



ISO 



100 



so 



1.0 



0.0 



T.o 



3.0 



Log V. 



FIG. 33. Illustrating the Influence of Temperature on the Ionization and the Con- 

 ductance of Electrolytes in Solvents of Relatively Low Dielectric Constant. 



in Figure 33 represent the values of the ionization at different tempera- 

 tures, the lower curves corresponding to the higher temperatures. In 

 order to secure a plot on which the ionization and conductance values 

 may be conveniently represented at all concentrations, the logarithms of 

 the concentrations, instead of the concentrations themselves, have been 

 plotted as abscissas. It will be observed that the ionization curves inter- 

 sect at a concentration of 3.6 normal, corresponding to the value log 

 C = 0.556. Actually, the intersections do not occur at a point, since the 



I 



ionization is given by the equation y = 



, 

 JD -f- 



and the constant K 



