ON AMMONIA C AL PLATINUM B ÅSES. C>i> 



Analysis of the bromonitrate dried över sulphuric acid: 



0,3360 gr. gave 0,1350 gr. platinum and 0,1270 gr. bromide of silver =(»,0040 gr. 

 bromine. 



The formula requires: 



Theory Experiment 



Platinum 197,ss — 40,56 40,18 



Bromine 80,o<> — 16, 40 16, 07 



Nitrogen 70,oo 



Hydrogen 12, 00 



Oxygen 128,oo 



487,88 



[B, 



)nh,-nh 3 o 

 » l t |o I 



5. Bromosulphate, Pt» ' 3 |SO L . + H 2 0, is prepared by adding bromine to a 



solution of the sulphate of platomonodiammine. The compound crystallises in crusts 

 of a line yellow eolour. It is without difficulty soluble in water, and under the micro- 

 scope it bas the appearance of an aggregate of minute needles. By heating to 100° — 

 110°, the bromosulphate löst 1,99 p.ct., which eorresponds to one mol. water for two 

 niol. of the bromosulphate. 



Analysis: the sulphate dried över oil of vitriol. 



0,3005 gr. gave 0,1130 gr. platinum and 0,2095 gr. bromide of silver =0,0892 gr. bro- 

 mine and 0,1400 gr. sulphate of barium =0,0192 gr. sulphur. 



The formula requires: 



Caleulated Found 



Platinum 197,88 — 37,84 37,60 



Bromine 160,00 — 30,60 30,65 



Sulphur 32,oo — 6,12 6,39 



Nitrogen 42, 00 



Hydrogen 1 l,oo 



Oxygen 80,00 



522,88 



The following compounds of platinmonodiammine are known: 



r ~ 



^1-1 _i ™ t^ NH, XH, 



Chloroc-ompound R — Pt> NH NH 



Ici 3 ' ' 

 1. Chloride RC1 2 l ) 



) The chloride, (undried at 100°) probably contains water like the other salts. 



