Chloriodide of Platinum. 261 



The Iodide was also reduced and gave 0.50 grammes. These 

 weights of silver are equivalent to 0.065 chlorine and 0.563 iodine 

 If Thomson's numbers be adopted. 



(fj One gramme of the chloriodide of platinum was heated, to see 

 if it had absorbed any hygrometric moisture. The heat was raised to 

 300° F. Water condensed in the cool part of the tube, and the 

 loss of weight was 0.03 grammes = 3 per cent. 



Recapitulation. 



Platinum, (b) 0.315 31.50 



Chlorine, (e) 0.065 6.50 



Iodine, (c) 0.563 56.30 



Water, (f) 0.030 3.00 



Loss, 0.027 2.70 



1.000 100.00 



There was an evident loss of iodine and probably of chlorine, 

 vide (c). To remove this source of error, another analysis was 

 made, the same method being used as before, except that in (c), ni- 

 trate of silver was added to the solution of carbonate, muriate and 

 hydriodate of potassa ; and carbonate, chloride and iodide of silver 

 were precipitated. Nitric acid was then added to decompose the 

 carbonate of silver, while the chloride and iodide remained. Two 

 grammes of chloriodide of platinum previously heated to 300° F. to 

 drive off all hygrometric moisture, were operated on. During the 

 decomposition by heat, a little iodine vapor was perceived to escape 

 above the carbonate of potassa, but the quantity must have been 

 very minute. 



The results of this analysis are 



Platinum, .6500 32.50 



Iodine, 1.1922 59.61 



Chlorine, 0.1406 7.03 



Loss, 0.0172 0.86* 



2.0000 100.00 



* If the loss, 0.86, he divided hi proportion to the niinibers indicating the propor- 

 tions of chlorine, iodine and platinum, and added to those numbers respectively, 

 the result of the analysis would be, 



Platinum, 32.78 



Iodine, C0.I3 



Chlorine, 7.09 



100.00 



