28 P. T. OLE VE, 



22. Suiphite of cobalt and platosammine R{ " so " }Co+6H 2 was obtained by mix- 



ing the solutions of the chloride of cobalt and of the double suiphite of ammonium. 

 The compound forms small, well defined crystals of a rosy colour. They are very 

 slightly soluble. They do not lose their water över sulphuric acid. 



Analysis: 0,4525 gr. g;ive 0,2840 gr. sulphate of cobalt and metallic platinum, 

 which calculated in percent is 62,76, and the formula requires 63,14. 



23. Suiphite of uranyl and platosammine R{ ' so ' o |U 2 02+2H 2 0. A solution of the 



nitrate of uranyl with a solution of the ammonio-sulphite produces a yellow volumi- 

 nous precipitate, which is slowly transformed to a heavy powder, composed of grains 

 consisting of very minute prisms. The salt dried över sulphuric acid löses 2,69 p. et. 

 water at 100° or one molecule; calculated =2,58 p. et. 

 Analysis of material dried at 100°. 



a. 0,2225 gr. were strongly ignited and gave 0,1575 gr. platinum and uranoso- 

 uranic oxide. 



b. 0,4780 gr. gave 0,1350 gr. metallic platinum and 0,3190 gr. sulphate of ba- 

 rium =0,0438 gr. sulphur. 



The formula requires: 



Found 



Platinum 29, 12 28,24 



Sulphur 9,42 9,16 



Platinum + Uranoso Uranic oxide 70,36 70,78 



24. Suiphite of Copper and Platosammine R{ ' so ' \Cu + 5H>0 was obtained by 



mixing the solutions of nitrate of copper and of the ammoniosalt. The double sui- 

 phite soon crystallises in needles of a light bluish-green colour. It is very slightly so- 

 luble in water. When examined with the microscope the crystals seem to be thin and 

 they present the appearance of obliquely truncated prisms. The suiphite is soluble in 

 hydrochloric acid, and assumes a brown colour. Nitro-muriatic acid with the suiphite 

 produces bright yellow octahedral crystals (chloride of platindiammine). The sui- 

 phite does not change its weight över sulphuric acid. 



Analysis: material dried över sulphuric acid. 



a. 0,3440 gr. gave 0,04sr. gr. water at 100° and, after being strongly ignited, 

 treated with nitric acid and again ignited, it gave 0,1760 gr. metallic plati- 

 num and oxide of copper. 



b. From 0,3380 gr. were obtained 0,3070 gr. sulphate of barium = 0,0422 gr. 

 sulphur. 



The formula requires: 



Calculated Found 



Platinum + oxid of Copper 50 89 51,16 



Sulphur 11,74 12,48 



Water ( 4 / 5 ) 13,20 13,23 



