MEASUREMENTS WITH CADMIUM AMALGAMS. 



Potentials of Cadmium Amalgams. First Series. 



47 



The second cell contained amalgams No. 2, No. 3 ; also No. 7 and No. 8, 

 made by the dilution of No. 3 inside the cell to about one-half and one-quarter 

 its original concentration. 



Its temperature was 23.03 C. = 296.1 1, and the potential of the Helm- 

 holtz cell was X = 0.9929. 



Potentials of Cadmium Amalgams. Second Series. 



Calculated from 3-8 and 3-7, the value of Dir for 7-8 is 0.00002, while 

 from the direct reading the value is 0.00003. 



No matter how satisfactory a set of readings appears, it should be checked 

 by a determination in duplicate. A fresh portion of cadmium was therefore 

 made by electrolysis and converted into amalgam No. 9, designed to have 

 as nearly as possible the same concentration as No. 1. 



Weight of cadmium 1.361 



Weight of mercury 44-5 2 7 



Cadmium dissolved in ammonia 0.0084 



Percentage content of Cd No. 9, calculated 2 -949 



Percentage content of Cd No. 1, calculated 2 -953 



Density of amalgam 9 13.471 



From No. 9 two amalgams were made by dilution inside the cell as usual. 



