ON AMMONIACAL PLATINUM BASES. 31 



As Gerhardt has remarked the chloride is affected neither by nitric nor by sul- 

 phuric acid. With the hydrate of potassium the chloride does not give off ammonia, 

 but it dissolves by boiling, and from the clear solution thus obtained a dirty yellow 

 powder is precipitated by adding hydrochloric acid. 



Ammonia dissulves the chloride by boiling to a light yellow liquid, which yields, 

 when alcohol is added, a curdy white precipitate. 



Gerhardt statt», that with aminonia the chloride gives the chloride of platin- 

 diammine, but he has not published any analysis of the product. The precipitate, ob- 

 tained by me b\ adding alcohol to the solution of the chloride in amtnonia, was very 

 soluble in water. Dried at 100° it contained. 



Ratio 



Platinum 53,41 1 



Chlorine 23,i<» 3,42 



When the white matter had been heated with hydrochloric accid, and then sub- 

 jected to an analysis the following result was obtained. 



Ratio 



Platinum 50,56 1 



Chlorine 30,40 3,35 



The product was next treated with a little water, and the solution hltered and 

 evaporated in the air-pump. The dry rest was a yellowish, scarcely crystalline matter, 



contaimiig 



Ratio 



Platinum 48, ?7 1 



Chlorine 29,53 3,4 



Water 2,68 



i:. 



I N H H r 



2. Bromide Pti NH 3 Bl . is easily obtained by adding bromine to the broinide of plato- 



sammine, inixed with water. The bromide forms a heavy orange-coloured powder 

 of well developed, square microscopical tablets, or octahedrons. It is with difficulty 

 soluble in water, which assumes a very deep colour. 



Analysis : 

 1,2683 gr. gave 0,i63i gr. metallic platinum and 1,7125 gr. bromide of silver, or 

 0,7288 gr. bromine 



The formula requires: 



Calculated Found 



Platinum 197,88—35,85 36,51 



Bromine 320,00—57,98 57,46 



Ammonia 34,ou — 6,17 6,n3 (loss) 



551,88 100,oo 100,oo 



