ON AMMONIACAL PLATINUM BASES. 33 



but the third does not give any probable formula. The yellow iodide has no distinct 

 crystalline form and is insoluble in water. It gives with acids black products. The 

 product obtained by the action of sulphuric acid was found to contain 49 p. et. pla- 

 tinum and only 3 p. et. sulphur. The black powder, obtained with hydrochloric acid 

 gave by analysis 



Ratio 



Platinum 47,97 0,242 



Iodine 34, i? 0,27i| A 



Chlorine 6,00 (»,i69l 



The ratio between platinum and iodine + chlorine is nearly as 1 : 2. The product was 



i 

 nh, . x 



probably a mixture of a chloride and iodide of the formula Pt, 



™ 3 |o. xbeing = Clor I. 



NH 3 . X 

 I 



— Nitric acid communicates a black colour to the yellow iodide, but if the mixture is 

 heated to boiling it is again ehanged to yellow; some violet vapours of iodine are 

 also given off. This yellow powder was analysed, but in different preparations the 

 products had a varying composition (56 — 57 p. et. platinum 9 — 5 p. et. iodine, 12,50 

 p. et. nitrogen). The liquid, separated from the yellow powder, was evaporated to a 

 small volume, when crusts of an easily soluble salt, containing no iodine, were obtained. 

 They gave by analysis: 



Platinum 43,75 



Nitrogen 18,22 



which agrees with the formula Pt . 2NH 3 . 2N0 3 . 2N0 2 , which requires 



Platinum 44, is 



Nitrogen 18,70 



The yellow iodide is also decomposed by a mixture of permanganate of potassium and 

 hydrochloric acid ; iodine is slowly given off by boiling the liquid, and a yellow un- 

 crystalline powder then remains. Its analysis gave 57,78 — 58,82 p. et. platinum and 27,22 

 — 28,45 p. et. chlorine, but I cannot from this composition calculate any probable 

 formula. 



I 1 

 On the iodide Pt^^i being boiled with potash lye and the insoluble yellow 



I i 

 product separated by filtration a light-yellow solution passed through, which, by 

 neutralisation with hydroiodic acid, gave a black, perfectly uncrystalline powder. The 

 analysis of this product gave: 



Platinum 35,97 



Iodine 57,17 



which agrees with the formula Pt8NH 3 .I in , requiring: 



K. Vet. Akad. Hantll. Ii. 10. N":o 9. ' J 



