HO p. T. ('LEVE, 



c. 0,4180 gr. gave 0,098<i gr. carbonic acid =0,0267 gr. carbon and 0,1 120 gr. water 

 = 0,0124 gr. hydrogen. 



The formula requires: 



Theory Experiment 



Platinum 395,76—59,82 59,91 (a) 



Chlorine 141,84 — 21,44 21,66 (a) 



Nitrogen 56, 00 — 8,46 8,34 (b) 



Hydrogen 20,oo — 3,02 2,9». (c) 



Carbon 48,oo — 7, 20 6,39 (c) 



661,60 100,no 99,26 



2NH 3 C When I boiled the 



nitrate and the sulphate of platosemidiammine with ethylamine, and the solutions were 

 evaporated in the water-bath some metallic platinum was deposited and black gum-like 

 masses remained. 



B. Compounds of the radicle Pt{^ 3 ; JJ ^ = R - 



1. Chloride, RC1 2 . The chloride of platosammine is easily dissolved by boiling 

 with aqueous ethylamine and the colourless solution deposits fine colourless needles on 

 cooling. The chloride is soluble in hot water without difficulty and the solution turns 

 stiff from the mäss of crystals formed on cooling. 



The chloride dried över sulphuric acid does not change its weight by heating 

 to 100°. 



Analysis: 

 0,i275 gr. gave 0,2150 gr. platinum and 0,3115 gr. chloride of silver =0,0770 gr. 

 chlorine. 



The formula requires: 



Theory Experiment 



Platinum 50,38 50,29 



Chlorine 18,os 18,oo 



This chloride is much less soluble than the isomeric coinpound (A. N:o 1). If 

 its solution is mixed with iodide of potassium snow-white nacreous scales are obtained. 

 They were not analysed by me, but seem to be the iodide RI 2 . If the solution is 

 boiled with the iodide of potassium, ammonia is slowly given off and a crystalline pow- 

 der of a fine yellow colour separates. This yellow iodide contained much ethylamine 

 and left 37,65 p.ct. platinum by igniting. The iodide of platosammine contains 40,7 p.ct. 



platinum, but the iodide Pt\ NH : c f Cl 2 requires 36,5 p.ct. platinum. 



By this reaction I expected to obtain the iodide of platosammine. Probably the 

 strongly basic ethylamine is more firmly fixed than the ammonia. 



