PALLADIUM. 321 



Pd(NH,Cl\. Pd. Per cent. Pd. 



1.60842 .80997 50-358 



2.08295 1.04920 50.371 



2.02440 1-01975 50.373 



2.54810 1.28360 50.375 



I-75505 .88410 50-375 



Mean, 50.370, .0023 

 Reduced to vacuum, 50.351 



In a second series of experiments, palladium was purified as in the 

 earlier investigation, but with special care to eliminate rhodium, iron, 

 copper, gold, mercury, etc. The palladiammoniura salt prepared from 

 this material gave as follows : 



Pd(NH. A Cl} r Pd. Per cent. Pd. 



1.50275 .75685 50.364 



1.23672 .62286 50-365 



1-34470 .67739 50.375 



i .49S9 .75095 50-379 



Mean, 50.371, i .0026 

 Reduced to vacuum, 50.352 



Here, again, no loss from decrepitation or volatilization occurred, 

 although evidence of such loss was carefully sought for. The data thus 

 obtained may now be combined with the previous series, thus : 



Keiser, first series 50.360, dr .0008 



Keiser, second series 5-359, =b .0028 



Bailey and Lamb 50. 171, .0099 



Keller and Smith, electrolytic 50.508, rh .0014 



Keller and Smith, hydrogen series 50.388, dr .0043 



Keiser and Breed, first series 5O-35 1 , =b .0023 



Keiser and Breed, second series 5-35 2 > .0026 



General mean 50.388, dr .00062 



For palladium, ignoring the work of Quintus Icilius, the subjoined 

 ratios are now available : 



(i.) 2KC1 : Pd : : 100 : 70.865, dr .0150 

 (2.) Per cent. Pd in Pd(NH 3 Cl),, 50.388, dr .00062 

 (3.) 2AgCl : Pd(NH 3 Cl) 2 : : 100 : 73.807, dr .0742 

 (4.) Pd(NH 3 Cl) 2 : PdS : : 100 : 65.651, dr .0051 



The antecedent data are 



Cl = 35.179, i .0048 S = 3 1." 828, +3 .0015 



K = 38.817, .0051 AgCl = 142.287, .0037 



N = 13.935, dr .C02I 



21 



