340 



PROCEEDINCxS OF THE AMERICAN ACADEMY. 



THE ATOMIC WEIGHT OF NICKEL. 

 Fourth Series. — = 16. — Ratio = NiBrj : Ni. 



complete analysis of the best nickelous bromide which we were able to 

 prepare. It must be remembered that lo.olooG grams of the halide 

 contained, according to two different methods, 11.34985 and 11.34979 

 grams of bromine. 



COMPLETE ANALYSIS OF NICKELOUS BROMIDE. 



Per cent. 



= 26.824 



( Bromine combined 

 73.151% = ] with Nickel 



Nickel . . 



Total Bromine 



Total Impurity = 0.114 



} = 73. 



062 



) Bromine actually ) 



) found in impurity f ~~ 



Sodium 



0.089 

 0.025 



Total = lOO.OOOt 



* The weights of argentic bromide from wliich the sodic bromide was calcu- 

 lated were re.spectively 0.00520, 0.00516, 0.00615, 0.00687, and 0.00352 grams in 

 analyses 1, 2, 3, 4, and 5. For analyses 6, 7, and 8, the figures are given on p. 338. 



t As has been detailed, ^me of the earlier preparations contained traces of sul- 

 phuric acid in addition. Since this is not taken into account in the average, the 

 sura given is slightly too small, and is perhaps deceptive in its accurate showing. 

 The flaw was eliminated as soon as it was discovered, therefore we had no means 



