478 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



II. By electrolysis. 

 K.PtBr,. Pt. 



2.2110 .5726 



3.1642 .8188 



1.9080 .4947 



1.6754 .4341 



1.3148 .3403 



1.5543 .4025 



Mean of eighteen experiments, 25.915,±.0040 31.591,±.0068 



Hence Pt= 195.09 and 195.79. 



For ammonium platinchloride Halberstadt gives the following data 



/. By reduction in H. 



Am..PtCla. Pt. Per cent. Pt. 



1.0604 .4062 43.964 



1.3846 .6087 43.962 



1.5065 .6617 43.923 



2.3266 1.0227 43.956 



J 1.3808 .6059 43.880 



\ 1.7396 .7638 43.906 



r 2.7420 1.2068 44.011 



} 3.1882 1.4019 43.971 



[ 5.4044 2.4035 43.984 



3.4859 1.5321 43.951 



II. By electrolysis. 



AmnPtCl^. Pt. Per cent. Pt. 



.4161 43.920 



.4865 43.951 



.6634 43.930 



.2347 43.910 



.7044 43.928 



.8459 43.894 



.48.58 43.979 



.6233 43.959 



Mean of eighteen experiments, 43.943, ± .0054 

 Hence Pt= 195.01. 



For potassium platinchloride Halberstadt's data are- — 



/. By reduction in H. 



K„PtCl„. Pt. 2KCI. Per cent. Pt. Per cent. KCl. 



1.6407 .6574 .5029 40.069 30.651 



1.93.52 .7757 .5921 40.084 30.600 



1.5793 .6334 .4836 40.106 30.621 



1.6446 .0595 .5049 40.101 30.700 



1.0225 .4102 .31.33 40.117 30.040 



2.4046 .9641 .7388 40.094 30.724 



5.8344 2.3412 1.7905 40.127 30.688 



7.1732 2.8776 2.1998 40.116 30.666 



