FORM OF THE CONDUCTANCE FUNCTION 



71 



plotted against the values of the ion concentration to the power 1.18. 

 This plot is shown in Figure 10. The value for D in this case is not 

 altered from that originally determined, but the value of K is altered 

 from 1.26 to 1.20. 



It will be observed that, throughout, the points lie upon a straight 

 line within the limits of experimental error. The equation connecting 



K-UOXMT* 



0.0 



2.5 



5.0 



7-5 



12.5 



15 



17.5 



20.0 



FIG. 10. K D Plot for KNH, in NH,. 



the equivalent conductance with the concentration for solutions of potas- 

 sium amide in liquid ammonia is, therefore: 



K ' = 



n 



yl* Y/ 



= 0.095 (Cy) 118 + 1.20 X 10" 4 



where y=_. 



The calculated values are compared with the experimental values in 

 Figure 11, where the equivalent conductances are plotted as ordinates 

 against the logarithms of the concentrations as abscissas. It will be ob- 

 served that the calculated curve corresponds with the experimental curve 

 up to a concentration of approximately 2 normal. Beyond this concen- 

 tration the experimental curve departs rapidly from the calculated curve. 

 As we shall see presently, at higher concentrations, the viscosity of the 

 solutions increases very largely and it is therefore not possible to test 

 the applicability of the equation at these concentrations. 



It becomes a matter of interest to determine whether an equation of 



