ON AMMONIACAL PLATINUM BASES. 39 



When the silversalt was boiled with a solution of an equivalent quantity of 

 chloride of barium, chloride of silver was thrown clown and from the solution rhom- 

 bic scales, containing no barium were crystallised on cooling. 



{VfT ( *1 

 nh! o no ^ a S0U1 ti° n of chloroplatinite of potassium 



is mixed with a solution of the nitrato-nitrite (N:o 6) the dark-red liquid, when heated 

 >oon changes its colour to yellow, and small, very bright, lemon-coloured crystals are 

 deposited. Examined with the microscope they seem to have the form of thick rhom- 

 bic tablets. The reaction may probably be represented by the following equation 



2NO s . Pt . 2NH 3 . 2N0 2 +K, . Cl, . Pt=2(K . NO ; ,)+Pt{ XO) + 2C1 . Pt2NH 3 {^ 



Analysis the salt dried at 100°: 



a. 0,40/7 gr, gave 0,2095 gr. platinum and 0,4578 gr. chloride of silver = 0,1132 gr. 

 chlorine. 



b. 0,2918 gr. gave 27 C. C. nitrogen (tem]> of the water 18°. Bar. 752 t. 18°) = 

 < l,03(i7 gr. nitrogen. 



The formula requires: 



Calculated Experiment 



Platinum 197,88 — 51,26 51,38 — 



Chlorine 106,38 — 27, 5 ti 27,70 — 



Nitrogen 42,oo — 10,88 10,52 



Hydrogen 6,oo 



Oxygen 32,oo 



384, 21; 



11. Bromonitrite 2Br . Pt{ XH ' 0N0 is easily obtained by adding bromine to the 

 nitrite of platosammine. It is a very slightly soluble clear lemon-coloured powder, 

 composed of inicroscopical, thick rhombic tablets. 



Analysis the bromonitrite dried at 100°. 



a. 0,i78o gr. gave 0,1960 gr. metallic platinum and 0,3718 gr. bromide of silver = 

 0,1582 gr. bromine. 



b. 0.2150 gr. gave 22,5 C. C. nitrogen (temp. of the water 18°. Bar. 764 m. in. 

 t. 18°) ~ 0,02<;03 gr. nitrogen. 



The formula requires: 



Theory Found 



Platinum 197,88 — 40,89 41, oo — 



Bromine 160,oo — 33,06 33,09 — 



Nitrogen 56,oo — 11,57 — 12, 10 



Hydrogen 6,oo 



Oxygen 64,00 



483,88 



