NOTES AND COOLIDGE. — ELECTRICAL CONDUCTIVITY. 217 



Table XIII also show3 that the dissociation vahies for the two chlo- 

 rides are nearly identical at all temperatures and concentrations, the 

 extreme variation being about 2 per cent in the 0.1 normal solution. 

 This gives support to the idea that the decrease of conductivity and of 

 the calculated dissociation is due to a physical cause (probably in some 

 way to the electrical charges on the ions) and not to specific chemical 

 affinity. The theoretical discussion of the results is, however, best post- 

 poned until we have made more extended series of measurements. 



/oo 



9S 



9o 

 es 



eo 



7S 



70 

 6S 



eo 

 so 



SOD/OM C^LOfi/D£. 



-^o 80 /SO /60 eoo 

 Figure 12. 



a^ifo 



23 O 



J20 



360 



The values of the constant K in the equation (1 — x) =KC' are 

 tabulated below, as these give a measure of the dissociation-tendency 

 independent of the concentration. They were obtained from the 



plots described in Section XIII by taking the ratio I j ) of the in- 

 tercepts on the two axes, of the best representative straight line, and 

 dividing this ratio by A^,. 



TABLE XIV. 

 Values of the Dissociation Constant (1 — .r) / Ci 



