306 



THE ATOMIC WEIGHTS. 



Co. 



.3458 

 3776 



4493 

 .4488 

 .2856 

 .2648 



Cobalt. 



AgCl. Ratio. 



1.6596 20.836 



1.8105 20.856 



2.1521 20.877 



2.1520 20.855 



1.3683 20.873 



1.2768 20.886 



Mean, 20.864, .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 by Volhard's 

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

 used was comparable with the metal taken. 



Nickel. 



Ni. 

 .1812 

 .1662 

 .2129 

 .2232 

 .5082 

 1453 



Co. 



.177804 

 .263538 

 .245124 

 .190476 

 .266706 

 263538 



Af. 



.6621260 

 .6079206 

 7775252 

 .8162108 



.8556645 

 . 53 r 5 4<> 



Cobalt. 



.6418284 

 .9514642 

 .8855780 

 .6866321 

 .9629146 

 .9503558 



Ratio. 

 27.366 



27.339 

 27.382 

 27.346 

 27.386 

 27.338 



Mean, 27.359, - OO 59 



Ratio. 

 27.702 

 27.699 

 27.679 



27.741 

 27.696 



27-73 1 



Mean, 27.708, .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. 



2549 

 .4069 



Ag. 



.9187 

 1.4691 



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



