G2 P. T. CLEVE, 



orange-coloured needles, which, under the microscope, have the form of rhombic, 



four-sided prisms with domatic faces to their ends. By slow crystallisation the bro- 



monitrite was obtained in needles several millimetres in lenght. It is with difficulty 

 dissolved by water, and the solution has a yellow colour. 



Analysis: the compound dried at 100°. 



0,4080 gr. gave 0,1675 gr. metallic platinum and 0,3200 gr. bromide of silver =0,1362 

 gr. broraine. 



The formula requires: 



Theory Experiment 



Platinum 40,89 41,03 



Bromine 33, ur. 33,38 



If the bromonitrite is sufnciently boiled with sulphate of silver for the precipi- 

 tation of the whole quantity of bromine, only one atom of bromine is separated as 

 bromide of silver and a yellow solution is obtained, which by evaporation deposits yellow 

 crystals and the excess of sulphate of silver. 



(Cl 



7. Basic Lhloronitrite, Pt\ N0 was prepared by boning the cnloromtrite 



lOH 



(N:o 5) with water and nitrate of silver. The solution filtered hot, deposits on cooling, 

 long, four-sided, and rather flat prisms, of a påle yellow. The compound is easily so- 

 luble in hot water and crystallises on cooling the solution. 



Analysis : 



0,4790 gr. gave 0,25io gr. platinum and 0,1830 gr. chloride of silver =0,0452 gr. 

 chlorine. 



The formula requires: 



Theory Experiment 



Platinum 197,88 — 52,58 52, 40 



Chlorine 35,46 — 9,42 9,44 



Nitrogen 56,oo 



Hydrogen 7,oo 



Oxygen 80,oo 



76,35 



51 



roH 



8. Sulphate Ptj 3 3 |S0 2 ? When the chloride of platinsemidiammine was boi- 



Ioh 



ed with water and sulphate of silver, chloride of silver was precipitated, though not 



completely. If the solution is evaporated in a warm place, chloride of silver separates, 



and by farther concentration a yellow, plaster-like semi-fluide mäss, is produced. This 



