ATOMIC WEIGHTS 



87 



Ag. 



4.77783 

 5.87977 

 4.82995 



Mean, 74.082. ± .0018 



A much more thorough and conclusive set of syntheses was published 

 by Baxter ' in 1906. The purest silver was dissolved in nitric acid, and 

 precipitated by ammonium bromide. The silver bromide, before weigh- 

 ing, was fused in an atmosphere containing bromine vapor. With vacuum 

 weights, Baxter's figures are as follows : 



Ag. 

 4.71853 

 5.01725 

 5.96818 

 5.G2992 

 8.13C12 

 5.07238 

 4.80711 

 4.27279 

 5.8G115 

 7.91425 

 6.40765 

 6.38180 

 6.23696 

 9.18778 

 8.01261 

 10.48638 

 8.59260 

 8.97307 



Mean, 74.0785, ± .00047 



The direct determinations of the ratio Ag : Br combine thus : 



Richards 74.065, ±: .0035 



Richards, Collins and Heimrod 74.0706, ± .0078 



Huntington 74.071, ± .0072 



Scott 74.072, ± .0023 



Marignac 74.077, ± .0030 



Baxter, 1906 74.0785, ± .00047 



Stas 74.081, ± .0006 



Baxter, 1904 74.082, ± .0018 



General mean 74.0797, ± .00035 



Analyses of various metallic bromides have furnished many incidental 

 determinations of the silver-bromine ratio, like those already described 



' Journ. Amer. Chem. Soc, 28, 1322. VM6. 



