ON AMMONTACAL FLATINUM BASES. 25 



6. Sulphite of ammonium and platosammine RJ o. so. o 'nu* Was obtained by Pey- 

 rone x ) by the action of sulphite of amnidnia in excess upon the chloride of the base. 

 When the chloride is added in small quantities to the solution of sulphite of ammonia, 

 it is soon dissolved, and alcohol added to the colourless solution precipitates a white 

 crystalline powder. By dissolution in water and slow evaporation the compound cry- 

 stallises in colourless, rhombical scales, very often, also, in twin-crystals. The sulphite 

 is soluble in water without difficulty and yields by oxydation with nitro-muriatic acid 

 bright yellow octahedral crystals (chloride of platinammine). 



■ . 

 Analysis: the sulphite dried at 100°. 



1. 0,4700 gr. gave 0,2140 gr. platinum and 0,5160 gr. sulphate of barium — 0,070<t 

 gr. sulphur. 



2. 0,5380 gr. gave 0,2470 gr. platinum and 0,5930 gr. sulphate of barium 0,o84l 

 gr. sulphur. 



The formula requires: 



Calculated Found 



1 2 



Platinum 197,88 — 46,25 45,53 45, '.ti 



Sulphur 64,oo — 14,90 15, 08 15,13 



Nitrogen 56, oo 



Hydrogen 14,00 



Oxygen 96,00 



427,88 



17. Sulphite of silver and platosammine Rj o i so 'o (Ag 2 + H 2 is precipitated in 

 form of a snow-white powder by adding nitrate of silver to the solution of the prece- 

 ding compound. If t"he sulphite is left in the liquid, it soon becomes transformed into 

 microscopieal, moss-like and crystalline aggregates. 



Analysis: the compound dried at 100°. 



a. 0,6190 gr. were melted with carbonate of sodium and some chlorate of potas- 

 sium. The melted mäss left by treating with water 0,4130 gr. silver and plati- 

 num; the solution gave 0,4600 gr. sulphate of barium 0,0632 gr. sulphur. 

 The mixture of silver and platinum was heated with bisulphate of sodium, 

 and by solution in water 0,2015 gr. platinum were obtained. From this nura- 

 ber the weight of the silver is calculated at 0,2115 gr. 



b. 0,5820 gr. were mixed with sulphuric acid and heated. The weight of the 

 mixture of platinum and sulphate of silver was 0,4760 gr. or 81,78 per. et. 



') 1'l'IYKONE 1. C. 



K. Vet. Akad. Handl. B. 10. N:o 9. 



