52 P. T. CL EVE, 



with water and thus were obtained 0,0685 gr. platinura, from which weight it 

 raay be calculated that the sulphate of silver weighed 0,-M90 gr. =0,1516 gr. 

 silver. 



The formula requires: 



Calculated Experiment 



a b 



Platinum 197,88—21,891 I 21,88 



Silver 431,88— 47,7<i| 69 ' 68 46,8ij 71 ' / ' 3 48,44 



Sulphur 96,oo—10,62 10,93 



Oxygen 144,oo 



Ammonia ... 34,oo 

 903,76 



15. Sulphite of barium and platosemidiammine, Rj (S0 ' >2Ba+H 2 . , was obtai- 

 ned by double decomposition of the amrnoniosulphite (N:o 13) and chloride of barium. 

 The compound is a gelatinous precipitate, which soon becomes fine-grained. When 

 dried it resembles magnesia alba. The analysed salt was washed with cold water and 

 dried at 100°. 



Analysis : 



0,5615 gr. gave 0,3-ioo gr. sulphate of barium =0,1999 gr. barium, 0,1455 gr. metallic 

 platinum and 0,5280 gr. sulphate of barium =0,0694 gr. sulphur. 



The formula requires: 



Calculated Found 



Platinum 197,88 — 25,99 25,91 



Barium 274,oo — 35,87 35, 60 



Sulphur 96,oo — 12,57 12,36 



Nitrogen 28, oo 



Hydrogen 8,oo 



Oxygen 160,00 



763,88 



The formulas for all the known compounds of platosemidiammine are as follow: 



R=Pt"{ NH '~ NH ' 



1. C/doride RC1 2 



2. Bromide RBr 2 



3. Jodide RI 2 



4. Cyanide RCy 2 



5. Platocyanide RCy 4 Pt+3H 2 O ? 



6. Sulphocyanate R(CyS) 2 



7. Nitrate R . 2NO. 



