ATOMIC WEIGHTS 



461 



First : Reduction of clipbenyl-pallad-diaramonium chloride, 

 Pd(CeH5.NH,Cl)2: 



Mean, 29.390. ± .0029 



Hence Pd = 107.01. 



Second: Eeduction of diphenyl-pallad-diammonium bromide, 



Mean, 23.622, ± .0023 



Hence Pd = 107.01. 



Third: Reduction of palladium ammonium bromide, (iSrH^)2PdBr^ 



Mean, 23.1135, ± .0018 



Hence Pd = 100.1)5. 



These determinations are notably higher than those made by other 

 methods. After reduction, the palladium was heated to redness for two 

 hours in a stream of dry air, to remove possible carbon. It was then 

 heated again in hydrogen, and finally cooled in a current of air. Hydro- 

 gen could hardly have been occluded in the final product. 



Amberg,' whose determinations appeared in 1905, resorted to pal- 

 ladiammonium chloride as his initial substance. Three series of analyses 

 were made, with scrupulously purified material, and all weights were 

 reduced to a vacuum. First, the salt was reduced electrolytically. The 



* Liebig's Annaleii, 341, 255. 



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