ON AMMONIACAL PLATINUM BASES. 21 



with the chloride of platindiaramine. The tetrachloride of platinum thus gives two 

 atoms of chlorine to the platosammine, which then changes to platinammine. The re- 

 action is exactly the same as I formerly showed takes place between tetrachloride of 

 platinum and platodiammine *). 



Hyponitric acid. The red vapours evolved by starch and nitric acid produce, 

 when led through a solution of the nitrate, a blue colour of the liquid and a white 

 crystalline powder of the nitrite of platosammine is precipitated in a short time. 



X itro-muriatic acid or chlorine gives the chloride of platinammine. 



Ferric chloride mixed with the solution of the nitrate and slightly heated gives 

 ferrous chloride and yellow octahedrons of the chloride of platinammine. 



Ferrocyanide of potassium produces after several hours a greenish coloration in 

 the solution; ferricyanide of potassium gives no precipitate, only producing a brownish- 

 red colour. 



Chromate and bichromate of potassium give dark brown, uncrystalline precipitates. 



Phosphate of sodium (Na.., H . 3 . PO) gives after some time, light yellow or al- 

 most colourless four-sided prisms. 



9. Xitrite R.0 2 .2NO is described by I. Lang 2 ) I have prepared the nitrite by 

 hyponitric acid and the nitrate of platosammine (analys 1.) and also by boiling the 

 chloride of platosammine with nitrite of potassium, slightly acidulated with acetic acid 

 (anal. 2). 



Analyses: 



1. a. 0,6830 gr. gave 0,4140 gr. metallic platinum. 



b. 0,3630 gr. gave 53 C. C. nitrogen (temp. of the water 10°, Bar. 753 m.m. t. 18°) 

 = 0,06258 gr. nitrogen. 



c. 0,i990 gr. gave 0,09io gr. water =0.oioi gr. hydrogen. 



2. 0,37io gr. gave 0,2280 gr. platinum. 



The formula requires: 



Calculated 1 Found Lang found 

 a b c 2 



Platinum 197,88 — 61,09 60,61 — — 61,45 61,14 



Nitrogen 56,oo — 17,29 — 17,24 — — NH 3 10,17 



Hydrogen 6,oo— 1,85 2,02 



Oxygen 64,oo— 19,77 — (20,13) — 



323,88 100,oo 



The nitrite is a snow-white powder of microscopical needles. It dissolves easily 

 in boiling water and recrystallises by cooling the solution in small, four-sided prisms, 

 sometimes very flat. When heated it is violently decomposed w r ith detonation and lea- 

 ves metallic platinum in a very voluminous state. 



x ) Cleve Am. Plåt. för. p. '27. 



-) Lang Kongl. Vet. Ak. Handl. 5 1864 N:o 5 p. 9. 



