OF ZINC, CADMIUM, LEAD, COPPER, AND LITHIUM 



49 



TABLE n. Electrical Measurement of Lead Amalgams. 



The last column in table n shows the great deviation of the strongest 

 amalgams from the simple equation 



RT , c m 



TT= FT In ~ 



vF C n 



and indicates, as usual, that this deviation approaches zero as the dilution 

 proceeds in the usual fashion. The fact becomes yet clearer when the 

 results are plotted as the other metals have been. Fig. 1 1 gives this curve, 

 drawn on the same scale as those previously given. 



-I 



-2 



logE Iog4- Iog8 log 16 lo3Z log 64 Iogl28 Iog,a56 

 Fig. 1 1 . The Deviations of the Electromotive Force of Lead Amalgams. 



Deviations from the expression tt = -^p- In ~ are plotted in millivolts as ordinates, 



the logarithms of the concentration ratios as abscissae. The most concentrated 

 amalgam contained 1.02 per cent by weight of lead and 98.98 per cent by 

 weight of mercury. A horizontal line on the diagram would indicate com- 

 plete fulfilment of the concentration law. This curve is almost if not quite 

 independent of temperature, at least between o and 30. 



