326 THE ATOMIC WEIGHTS. 



Hence we have the followhig percentages, reckoned on the original 

 salt : 



Ir. 2KCI. Cly 



39.881 30-829 29.290 

 39.890 30-842 29.277 

 39.868 30-813 29.300 



39.876 30.835 29.289 



39.877 30.825 29.287 

 39.879 30.8U 29.310 



39.882 30.814 29.285 



39.883 30.792 29.288 



Mean, 39.880, dz .0015 Mean, 30.820, i .0037 Mean, 29.291, ± .0024 



Joly * studied derivatives of iridium trichloride. The salts were dried 



at 120°, and reduced in hydrogen. With IrClj.SKCl.SH^O he found as 



follows : 



Salt. Ir, KCl. 



1.5950 .5881 .6803 



1.6386 -6037 .7000 



2.6276 .9689 1-1231 



These data, if the weight of the salt itself is considered, give discordant 



results, but the ratio Ir : 3KC1 : : 100 : x is satisfactory. The values of x 



are as follows : 



115.677 



115-952 



115-915 



Mean, 115.848, zb .0583 



The ammonium salt, IrClj.SNH^Cl, gave the subjoined data : 



Wt. of Salt. Wt. of Ir. Per cent. Ir. 



■i.SlT^' .6627 42.017 



1.6056 .6742 " 4''.990 



Mean, 42.003, =b .0094 



To sum up, the ratios available for iridium are these : 



(i.) Per cent. Ir in Am2lrClg, 43.732, zh .0035 

 (2.) Per cent. Ir in KjIrClg, 39.880, =h .0015 

 (3.) Per cent. KCl in K2lrClg, 30.820, ± .0037 

 (4.) Per cent. CI4 in KjIrClg, 29.291, ± .0024 

 (5.) Per cent. Ir in AmglrClg, 42.003, dz .0094 

 (6.) Ir : 3KCI : : 100 : I15.848, ± .0583 



The data for computation are — 



*Compt. Rend., no, 1131. 1890. 



