ON AMMONIACAL PLATINUM BASES. 49 



Calculated Experiment 



Platinura 197,88—60,35 59,78 59,92 



Sulphur 32,oo — 9,76 10,to 



Ammonia 34, oo 



Oxygen 64,oo 



327,88 



10. Oxalate, a.R. 2 . Cj0 2 +2H.O, was prepared by adding a solution of oxalate 

 of ammonia to the nitrate (7). The oxalate crystallises in colourless microscopical 

 needles. 



Analysis: the oxalate dried över sulphuric acid. 



a. 0,2255 gr. gave 0,12 15 gr. metallic platinum. 



b. 0,3522 gr. gave 0,0902 gr. carbonic acid =0,02if. gr. carbon and 0,1016 gr. water 

 = 0,oii3 gr. hydrogen. 



The formula requires: 



Calculated Experiment 



Platinum 197,88 — 55,60 55, 21 



Carbon 24,00 — 6,7'» 6,98 



Hydrogen 10,oo — 2,89 3, 21 



Nitrogen 28,oo 



Oxygen 96,oo 



355,88 



In the air-bath at 100° the oxalate löst 10,20 p. et. water, or 2 mol. H 2 (cal- 

 culated 10,12 p. et.). 



b. Anhydrous oxalate, R.0 2 .C 2 02, was thrown down by adding a solution of oxa- 

 lic acid to the solution of the nitrate. It is a white, or slightly yellow, powder of 

 microscopical needles. 



Analysis: 

 0,25io gr. gave 0,1530 gr. platinum, which is in p. et. 60,96. The formula requires 

 61,86 p. et. 



11. Chlorosulphite, (acid salt) RJ so h ' s °btained by the action of sulphurous 

 acid upon the chlorides of plato- or platinsemidiammine. The gas is led through the 

 boiling solution during several hours. If the colourless solution thus obtained be eva« 

 porated in the water-bath, the chlorosulphite crystallises in thin, flat, colourless prisms 

 or scales. The chlorosulphite is easily soluble in water. Nitromuriatic acid produees 

 yellow hexagonal scales of the chloride of platinsemidiammine with the compound. 



Analysis: the chlorosulphite dried at 100°. 

 1. the compound prepared with the chloride of platosemidiammine. 



K. Vet. Akad. Hanrtl. B. 10. N:o 9. » 



