OX AM.MONIACAL PLATINUM BASES. öl 



2. Chloroplätinite, RCL^CLPt, is thrown down as a voluininous crystalline pre- 

 cipitate of a fine green colour, when the solution of the preceding chloride is inixed 

 with a solution of chloroplätinite of potassiura. 



Analysis: 



0,.")3io gr. gave 0,3210 gr. platinum and 0,i635 gr. chloride of silver =0,1146 gr. 

 chlorine. 



The formula requires: 



Theory Experiment 



Platinum 59,82 60,'.:> 



Chlorine 21,44 21,58 



3. Sulphate, RO L » . SO*. The sulphate of platosammine is united with two molec. 

 of ethylamine if its solution is boiled some time with the base. The reaction pro- 

 ceeds slowly, but is fully completed when, on adding hydrochloric acid to a few dröps 

 of the liquid, a yellow precipitate of the chloride of platosammine is no longer produ- 

 ced, but white crystals in place of it. If the solution is evaporated in the water-bath 

 and left to crystallise, the sulphate is obtained in colourless, flat, and long needles. 

 The sulphate is ensily soluble in water. In dry air the crystals become white from 

 the loss of water. When dried at 100° the sulphate is anhydrous. The crystallised 

 salt seeins to contain 6 mol. H.,0 (found 18,70 p.ct. Aväter, calculated 20, 10. The sul- 

 phate had löst a small portion of its water). 



Analysis: the sulphate dried at 100°. 



0,3030 gr. gave 0,H30 gr. metallic platinum and 0,1800 gr. sulphate of barium 

 = 0,0'- ) i7 gr. sulphur. 



The formula requires: 



Theory Experiment 



Platinum 47,37 47, io 



Sulphur 7,65 8,i") 



4. X it råte is easily obtained by heating a solution of the nitrate of platosam- 

 mine with ethylamine. The nitrate crystallises well in fine colourless needles, which 

 are easily soluble in water. If the nitrate is treated with chlorine it yields small, le- 

 mon-coloured, rhombic tablets, which seem to correspond with the nitrate of Gros. 



C. Compounds of the radicle Pt|Jj£ c = R. 

 1. lodide, RL, is thrown doAvn in the form of yelloAv poAvder, if iodide of 



jO\TtI \ 



potassium be added to a hot solution of the chloride Pn^xH^c) -' ammoma ana " ethy- 

 lamine being evolved. 



K. Vet. Aka.1. Handl. 15. 10. N:o Ö. ti 



