ON AMMONIACAL PLATINUM BASES. 67 



Theory Experiment 



Platinum 197,88 — 57,38 56, 79 



Sulphur 32,oo — 9,28 9,65 



Nitrogen 42,oo — 12,i.s 11,90 



Hydrogen 9,oo 



Oxygen 64,oo 



344,88 



The sulphate, which is not dried :it 100°, seems to oontain of water of crystallisation. 

 The known compounds of the platomonodiammine are the following R=Ptw H 3 



1. Chloride RC1 2 



2. Chloroplatinite 2RCl 2 +PtCl 2 



3. Nitrate R . 2 . 2NO]+H 2 ( > 



4. Sulphate R . 2 .S0 2 



I. COMPOUNDS OF PLATINMONODIAMMINE. 



|V„ ~XH Cl 



1. Chloride, 1'tixi^n was obtained by boiling the nitrate of platomonodi- 



l(i 

 ammine with nitrom uriati c acid. The chloride crystallises well in light yellow, tole- 

 rably soluble, shining rhombic tablets, or hexagonal leaves. They seem to contain 

 of water of crystallisation, which is given off at 100°. 



a. 0,2340 gr. gave 0,ii75 gr. platinum and 0,3355 gr. chloride of silver =0,082vi gr. 



chlorine. 

 h. 0,1805 gr. gave 17 C. C. nitrogen (temp. of water 16°, Bar. 762 m.m. t. 16°) 



= 0,0198 gr. nitrogen. 



The formula requires: 



Theory Experiment 



Platinum 197,88 — 50,<u 50, 21 



Chlorine 141,84— 36,3u 35,43 



Hydrogen 9, 00 



Nitrogen 42,oo — 10,75 10,95 



390,72 



011 



2. Nitrate, Pt\ N g 3 . .N0 2 + H.,0, was prepared by double decomposition be- 

 Iqh 

 tween the bromonitrate (N:o 3) of the base and nitrate of silver; bromide of silver is 

 precipitated and, by evaporation of the solution, which contains free nitric acid, snow- 

 white microscopical needles, which are pretty easily soluble in water, are obtained. Before 

 analysis the compound was recrystallised several times and dried över sulphuric acid. 



