306 



THE ATOMIC WEIGHTS. 



Co. 



.3458 

 •3776 



• 4493 

 .4488 

 .2856 

 .2648 



.0050 



In the volumetric determinations the neutral chloride, prepared as 

 before, was decomposed by means of a slight excess of potassium car- 

 bonate, and in the potassium chloride solution, after removal of the 

 nickel or cobalt, the chlorine was measured by titration hy Volhard's 

 method with a standard solution. of silver. The amount of silver thus 

 used was comparable with the metal taken. 



Nickel. 



Mean, 27.359, ± ^0059 



Cobalt. 



Mean, 27.708, ifc .0064 



In view of the possibility that the cobalt chloride of the foregoing ex- 

 periments might contain traces of basic salt, Winkler, in a supplement- 

 ary investigation,* checked them by another process. To the electrolytic 

 cobalt, in a platinum dish, he added a quantity of neutral silver sulphate 

 and then water. The cobalt gradually went into solution, and metallic 

 silver was precipitated. The weights were as follows : 



Co. Ag. 



.2549 

 .4069 



.9187 

 1. 4691 



* Zeit. Anorg. Chera., 4, 462. 1893. 



