ON AMMONIA C AL PLATINUM BASES. '21 



mined with the microscope, seerns to be composed of four-sided prims, with two or 

 four end-faces. 



The weight of this compound of manganese remained unaltered after drying both 

 över sulphuric acid and at 100°. 



0,ö2 , .iö gr. were strongly ignited and gave 0,2780 gr. platinum and manganoso- 

 manganic oxide or in per. et. calculated 52,40. The formula requires 52,85. 



20. Sulphiu of zinc and platosammine R| ' so ' |Zn+6H 2 was obtained by mix- 

 ture of the ammonio-salt and the chloride of zinc. The compound, which is very little 

 soluble, soon crystallises in small and well formed plates, prisms, or tablets, terminated 

 by one or two faces. 



The sulphite did not change its weight över sulphuric acid. 



0,5650 gr. were heated in the air bath to 100°. (the loss =^0,0770 gr. water.) 

 and then strongly ignated, when 0,2290 gr. of oxide of zinc and metallic platinum 

 were left. By dissolving in hydrochloric acid, 0,158« gr. platinum remained and from 

 this solution 0,0680 gr. oxide of zinc =0,0546 gr. zinc were precipitated. 



The formula requires: 



Calculated Found 



Platinum 35,03 33,98 



Zinc 1 1,51 11,51 



Platinum + Oxide of zinc 49,37 49,25 



HO ( 5 / 6 ) 15,93 16,5d 



One molecule of water then remains after heating at 100°. 



21. Sulphite of Nickel and platosammine R{ ' S0 ' [Ni+7H,0 is soon thrown down 



as a crystalline powder of a påle bluish or greenish colour, when the solutions of ni- 

 trate of nickel and the ammonio-sulphite of platosammine are mixed together. Under 

 the microscope the compound seems to crystallise in small tablets. It does not give 

 up water by drying över sulphuric acid, or if heated to 100°. 

 Analysis: 



a. 0,4940 gr. gave 0, '.1211 gr. sulphate of barium 0,0566 gr. sulphur. 



b. 0,3910 gr. were strongly ignited and gave 0,1850 gr. oxide of nickel mixed 

 with platinum which were dissolved in nitro-muriatic acid. The solution was 

 precipitated by chloride of potassium and gave 0,3265 gr. chloroplatinate of 

 potassium or 0,1321 gr. platinum. From the remaining liquid 0,0510 gr. oxide 

 of nickel or 0,0400 gr. nickel were obtained. 



The analysis calculated in per. et. gives: 



Found Theory 



a b 



Platinum 33,78 34,30 



Nickel 10,23 10,23 



Sulphur 11,45 1 l,oii 



Platinum and ( )xide 



of Nickel 47,31 47,30 



