ATOMIC WEIGHTS 



439 



.4488 

 .2856 

 .2648 



2.1520 

 1.3683 

 1.2768 



20.855 

 20.873 

 20.886 



Mean, 20.864, ± .0050 



Hence Co = 59.81. 



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 by Volhard's 

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

 used was comparable with the metal taken. 



Nichel. 



Mean, 27.359, ± .0059 



Hence Ni = 59.03. 



Mean, 21 



.0004 



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

 periments might contain traces of basic salt, Winkler, in a supplementary 

 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. 

 .2549 

 .4069 



Ag. 



.9187 



1.4691 



1 Zeit. anorg. Chem., 4, 462. 1893. 



