ON AMMONIACAL PLATINUM BASES. 23 



Found Reiset found Calculated 



a b 



Platinum 58,13 57,60 57,o«j — 57,00 197,88 — 57,21 



Sulphur 9,72 9,5?- — 32,00—9,25 



Nitrogen ' — 7,91 — 20,oo— 8,09 



Oxygen — — 80,oo 



Hydrogen — — — 8,oo 



345,88 



The sulphate analysed by me contaihed a small quantity of silver, from which 



1 was unable to purify it. 



12. Bioxalate R . O.. (C, O,), 2 HO + 2 H-, O . is precipitated in form of small co- 

 lourless needles, by adding a solution of oxalic acid to the nitrate of platosammine. 



Analyses, the oxalate dried över snlphuric acid: 



a. 0,2990 gr. löst at 100° 0,0265 gr. water and gave by ignition 0,1315 gr. metallic 

 platinum. 



b. 0,28vo gr. gave 0,0960 gr. carbonic acid — 0,026? gr. carbon and 0,0690 gr. water 

 =0,u/67 gr. hydrogen. 



The formnia requires Found 



a b 



Platinum 197,88 — 44,:;s 43,98 — 



Carbon 48,oo — 10,76 — 9,29 



Hydrogen 12,oo — 2,69 2,72 



Nitrogen 28,oo 



Oxygen 160,oo 



445,88 



The loss at 100° is, according to the analysis: a. 8,86 pc:t. The formula with 



2 H, O requires 8,07. 



By adding a solution of oxalate of ammonia to the nitrate of the base a white, 

 partly crystalline, precipitate is obtained, but it seems to be a mixture of different 

 compounds. 



13. Sulphite R . 2 . SO + H 2 O. was obtained by leading sulphurous acid through 

 a boiling solution of the nitrite. The solution assumes a greenish colour, which soon 

 disappears, and by evaporating in the water-bath it leaves a thick liquid, containing 

 much snlphuric acid. If alcohol is added to it, a white precipitate is obtained. This 

 precipitate washed with alcohol is easily soluble in water and the solution deposits, 

 by evaporation, small colourless needles, which are also dissolved in water without 

 difficulty. 



The solution of the compound is not precipitated by the chloride of barium, but 

 a white precipitate of sulphate of barium is iminediately produced by adding a few 

 dröps of chlorine, dissolved in water. 



