Iarchibald-kern] solubilities OF THE CHLOROPLATINATE 13 



Table I. 



These results were- plotted on co-ordinate paper, a smooth curve 

 drawn between the points, and the following values taken from this 

 curve for the even temperatures. 



Table II. 



Solubility of Ammonium Chloroplatinate in Water. 



These values are a great deal lower than those found by Crookes\ 

 who reported that at ordinary temperatures 100 parts of water dissolve 

 0-666 grams of salt, while at 100°, 12 -5 grams of salt were dissolved. 

 The lower values obtained by us are probably due, in part, to a 

 complete absence of nitric acid from the solution from which the salt 

 was precipitated and also to the fact that hydrolysis was largely 

 prevented by keeping the solutions in the dark while the tubes were 

 rotating in the bath. Experiments, as yet unpublished, show that 

 the ammonium chloroplatinate undergoes hydrolysis, due to the action 

 of the light, to as great an extent as the potassium salt. 



The Solubility in Water of Ammonium Bromoplatinate. 



In Table III are shown the values obtained for the solubility of 

 ammonium bromoplatinate, in water, at the different temperatures 



1 Chem. News, 9, 37. 



