ON AMMONIACAL PLATINUM BASES. 57 



The difference between the numbers found proves that I had a mixture. The 

 product, of which a part had been eraployed for analysis N:o 4, was then boiled with 

 water, and the remaining yellow powder dried at 100° and analysed 

 0,2775 gr. gave 0,1775 gr. metallic platinum and 0,2565 gr. chloride of silver =0,0034 gr. 

 chlorine. 



Cl, 



Experiment The formula Pt 2 { NH 3 NH 2 + H3O 



requireslcij 

 Platinum 63,96 63,67 



Chlorine 22,84 22,82 



When the yellow chloride, having this composition, was treated with hydrochlo- 

 ric acid and analysed I obtained 



Platinum 61,51 



Chlorine 26,67 



Hydrochloric acid probably acts in the same manner as upon the chloride 

 Jnft 3 nh 2 



rt ^ jNH 3 NH 2 



Ici 



3. Product of the hydrate Ptjj NH 3 — NH 2 +EL>0 and nitric acid. 



lon 

 If treated with nitric acid the hydrate assumes a black colour. The black com- 

 pound is not crystallised. When heated it explodes with great violence. 

 Dried at 100° it was subjected to the following analysis: 



a. 0,2800 gr. gave 0,193<) gr. platinum. 



b. 0,30io gr. gave 35 C. C. nitrogen (temp of the water 16° Bar. 744 m. m.) 

 = 0,0398 gr. nitrogen. 



ro . no 2 



The formula Pt.UT H 3 - NH 2 requires 

 'o . N0 2 



Theory Experiment 



Platinum 67,35 68,93 



Nitrogen 14,43 13,22 



4. Product of the hydrate and sulphuric acid. The hydrate, treated with diluted 

 sulphuric acid produces a black uncrystalline powder. It was Avashed with a little wa- 

 ter, squeezed, and dried at 100°. The anal} 7 ses gave the following result: 



1. 0,2945 gr. gave 0,2060 gr. platinum and 0,1210 gr. sulphate of barium =0,0166 gr. 

 sulphur. 



2. 0,3405 gr. gave 0,24io gr. platinum and 0,1380 gr. sulphate of barium =0,0189 gr. 

 sulphur. 



K. Vet. Akad. Handl. B. 10. X:o 9. O 



