ON AMMONIACAL PLATINUM BASES. 53 



8. Nitrite R . 2N0 2 



9. Sulphate R . S0 4 



10. Oxalate a. R.C,0 4 + 2H,0 



b. R.C,0 4 



11. Chlorosulphite R| so 0H 



12. Chloro-ammonio-sulphite a. R . O.. . (SO) 3 4 l RC1 4 + 2H.0 . 



b - 2 L^Io.(so) 2 o 3 .3nhJ + H*0. 



13. Ammonio-sulphite R . 2 • (SO) 3 . 4 . NH 4 



14. Silversidphite R . 0.(SO) 3 . 4 . 2Ag> 



15. Barnan sid phite R . 0,(SO) 3 4 . 2Ba+H,0. 



ON THE PRODUCTS FORMED BY THE ACTION OF ALKALIES UPON THE CHLORIDE 



OF PLATOSEMIDIAMMINE. 



If the yellow chloride is boiled with a strong solution of hydrate of sodium, 

 ammonia is not evolved, but the chloride changes colour and is soon transformed to 

 a dirty whitish powder, which, on being examined with the microscope, seems to be a 

 pseudomorphosis of the chloride. It is not soluble in water. If washed it assumes a 

 dirty brownish colour. The product was dried at 100° and analysed. The analysis gave: 



a. 0,3930 gr. gave 0,2230 gr. metallic platinum and 0,0170 gr. chloride of silver = 

 0,0042 gr. clilorine. 



b. 0,4125 gr. gave 36,5 C. C. nitrogen (temp. of the water 18°. Bar. 762 m. m. 

 t. 18°). =0,0421 gr nitrogen. 



These values calculated in per-centage are as follows: 



a b 



Platinum 76, n 



Chlorine 1,43 ■ — 



Nitrogen — 10,20 



The chlorine, being so very insignificant, is in all probability caused by undecom- 

 posed chloride. The composition otherwise agrees with the formula: 



2(Pt.2NH 3 )+3H 2 0. 



This formula requires: 



Platinum 395,76—76,44 



Nitrogen 56,oo — 10,81 



Hydrogen 18,oo 



Oxygen 48,oo 



517,76 



The compound does not seem to be soluble in water, and when heated it ex- 

 plodes with some violence. Hydrochloric acid united with it gives a dirty yellow pow- 

 der, which was found to be a raixture of the chloride of platosemidiammine and of a 



