262 Crystallized perchloride of Platinum. 



If we assume the relative proportions of chlorine and iodine in 

 the above analysis as correct, the synthetical composition of iodo- 

 chloride of platinum is 



Platinum, 32.711 



Iodine, 60.191 



Chlorine, - - - - - - 7.098 



100.000 



Adopting Thomson's numbers for platinum, iodine, and chlorine, 

 the atoms of these bodies in the above compound are nearly in the 

 ratio of 7 t 10 : 4. From this we may conclude that it is composed of 



Biiodide of platinum, _ - - 5 atoms. 



Bichloride of platinum, - - - 2 atoms. 



VIII. Crystallized perchloride of Platinum, 



Dr. Thomson after describing the perchloride of platinum, says, 

 "It would not be easy to analyze this chloride; but it enters into 

 combination with the chlorides of potassium, sodium, and ammoni- 

 um, forming double chlorides which constitute regular salts. By 

 the analysis of these chlorine salts it has been ascertained that the 

 perchloride of platinum is a compound of 



1 atom platinum, - - - - 12 



2 atoms chlorine, _ _ _ _ _ 9 



21*" 



The synthesis of the chloriodide of platinum in the preceding ar- 

 ticle, affords the means of calculating the composition of the crystal- 

 lized hydrated perchloride of platinum. It was there shown that 

 9.095 grammes of platinum, gave 24.64 grammes of crystalhzed hy- 

 drated perchloride of platinum. 



Adopting Thomson's numbers for chlorine, platinum and water, 

 the 9.095 of platinum would have 6.7874 of chlorine combined 

 with it as a bichloride. 



PI. 2 CI. PI. -1- 2 Cl. 



9.095 + 6.7874 = 15.8824. The water of crystallization 



Pl.-1-2C1.-|-Aq. Pl.-{-2Cl. 

 in the hydrated bichloride of platinum = 24.64 — 15.8824 = 



8.7576. The compound then contains 



* Thomson's "Chemistry of Inorganic Bodies," London edition, 1831. vol. i. 

 p. 664. 



