OF ZINC, CADMIUM, LEAD, COPPER, AND LITHIUM 



the values will accord, within a limit of error of measurement, with either 

 the equation of von Tiirin or of Cady. This seemed to us so clear that 

 further prolongation of the curves to the right seemed to us hardly worth 



+ 6 



+ 5 



+ 4- 



+ 3 



+ 2 



-f I 



-I 



-2 



Zn 



\ 



\ 



7 

 Sn 



log 2 log 4 Iog8 log 16 log 32 log 64- log 128 log 256 log 512 log 1 024 

 Fig. 12. The Approach of the Potentials of all the Amalgams to the Concentration Law. 



Deviations, both positive and negative, are plotted in millivolts as ordinates; 

 logarithms of concentration ratios are plotted as abscissa. Thallium, 

 indium, and cadmium give potentials greater than those corresponding 



n rrt 



to the equation it -^r / zinc, lead, and tin give potentials less 



than the actual values thus computed. The origin of abscissae _ corre- 

 sponds to 4.00 gram-atoms of dissolved metal per liter, and the diagram 

 extends to amalgams 1024 times as dilute as this (i. e., i gram-atom 

 per 256 liters). The dotted lines are extrapolated. The curves are 

 almost if not quite independent of temperature, at least between o" 

 and 30", excepting in the case of tin, which is only very slightly 

 soluble at o. 



