ON AMMONIACAL PLATINUM BASES. 61 



The forwula requires: 



Theory Experiment 



a b 



Platinum 197,88—57,88 55,81 — 



Nitrogen 42,oo — 12,18 — 12,96 



Hydrogen 9,00 



Oxygen 96,oo 



344,88 



When the gum-like nitrate had been treated with nitric acid and the excess of 

 the acid evoporated in the water-bath, an amorphous residuum was obtained. It con- 

 tained 43, 17 per. et. platinum, which is less than a neutral nitrate ought to contain. 

 It was doubtless a mixture of basic nitrates. 



|C1 

 ni, ■ ■ ™ INH, NH,.O.NO, i-!,., i\ ■ -i 



5. thloro-nitrite, rts N0 was obtained by Blomstrand ) in treating the 



Ici 

 nitrite of platosemidiammine with chlorine. The chloronitrite forms brittle needles, of 

 a light straw-colour, and soluble in water. 



Analysis of the compound dried at 100°: 

 0,2770 gr. gave 0,1370 gr. platinum and 0,2030 gr. chloride of silver, ^0,0502 gr. 

 chlorine. 



The formula requires: 



Theory Experiment 



Platinum 50,12 49,46 



Chlorine 17,96 18, 12 



Of the two atoms of chlorine in the molecule one is more firmly united with 

 the atom of platinum than the other. By treating the chloronitrite with compounds 

 of silver, only one atom of chlorine is extracted and hydroxyle substituted. Thus, with 

 nitrate of silver, the chloronitrite yields the basic salt: 



f C1 ~ 

 Jnh 3 ~nh 3 .o.no 



1 l IO. NO 

 loH 



If the chloronitrite is boiled with nitrite of silver sufficiently to precipitate the 

 two atoms of chlorine, only half of the chlorine is precipitated as chloride of silver, 

 nitrous oxid is evolved, and by refrigeration the light-yellow liquid deposits small straAV- 

 coloured grains or aggregates of microscopical needles. They contained silver, plati- 

 num and chlorine, but were not analysed. 



fBr 



6. Bromonitrite, Pt, ^ ' was also obtained by Prof. Blomstrand 2 ) by 



iBr 



treating the nitrite of platosemidiammine with bromine. The compound forms dark 



') Blomstrand öfvers. af K. Vet.-Akad. Förh. 1869 p. 244. 

 Blomstrand 1. c. 



