328 



THE ATOMIC WEIGHTS. 



In 1881 Seu])ert* published his determinations, basing them upon 

 very pure chlorophitinates of potassium and ammonium. The ammo- 

 nium salt, (NHJjPtClg. was analyzed by heating in a stream of hydrogen, 

 expelling that gas by a current of carbon dioxide, and weighing the 

 residual metal. In three experiments the h3'drochloric acid formed 

 during such a reduction was collected in an absorption aj^paratus, and 

 estimated by precipitation as silver chloride. Three series of experi- 

 ments are given, representing three distinct preparations, as follows : 



Another portion of this preparation, recr3'stallized from water, of 1.4358 

 grm. gave 0.6311 of platinum, or 43.955 per cent. 



■Ber. Deutsch. Chem. Gesell., 14, 865. 



