22 P. T. CL EVE, 



Hydrocldoric acid gives the nitrate first a blue, subsequently a green colour, 

 emitting at the same time, red vapours,- and finally it yields yellow crystals. The 

 yellow product examined with the microscope seeras to be composed of octahedral 

 crystals, resernbling those of the chloride of platinammine. 



Nitric acid boiled with the nitrite disengages red vapours during the dissolution 

 of the nitrite; the solution when evaporated gives large colourless crystals of 



. . . . r . . . NO,.01 n I NH 3 . O . NO 



the nitrato-mtnte or platinammine N0 |1 M nh .o. no. 



Sulphuric acid (concentrated) colours the nitrite blue. Water dissolves the blue 

 compound to a blue or greenish liquid, which by boiling emits red vapours and at the 

 same time löses its colour. 



Bromine added to the nitrite unites directly with the salt and produces the bro- 



. . „ ,, i NH3.0.NO 

 mo-nitrite br 2 .rt.j N h 3 .o.no 



Sulphurous acid produces in the solution of the nitrite a transient greenish 



( 1VTT O ^O 



colour, is oxydised to sulphuric acid and gives the sulphite Pt j NR~ 3 'oiso + H 2 O. 



Ammonia cannot be united with the nitrite, according to Lang. 



The strong amnity, with which the nitrosyl in this nitrite is bound is very re- 

 markable, as also the fact that ammonia cannot be united with this salt as with other 

 compounds of platosammine. 



10. Plato-nitrite R . O, . (NO) 4 . 2 Pt is described by Lang x ). 



11. Sulphate Ii . 2 . S0 2 + H 2 O, was obtained by Reiset 2 ) by double decompo- 

 sition of the iodide with sulphate of silver. I have prepared the sulphate with the 

 chloride of platosammine. The sulphate is a whitish-yellow saline mäss of indistinct 

 crystals. It is tolerably soluble in water. 



The sulphate gives, with muriatic acid, a yellow precipitate of the chloride of 

 platosammine, with nitro-muriatic acid it yields yellow octahedric crystals resernbling 

 the chloride of platinammine. Ammonia dissolves the sulphate easily, and produces 

 sulphate of platodiamniine. 



Iodine dissolved in alcohol produces with the sulphate a black powder. It 

 is free from sulphuric acid and contains 26,83 perc:t of platinum. The formula 



I 2 Pt I NH 3 j requires 26,75 perc:t of platinum. Chlorine and Bromine also give chloride 

 and bromide of platinammine. 



Analysis: 



a. 0,2520 gr. gave 0,1465 gr. metallic platinum and 0,1790 gr. sulphate of barium 

 = 0,0245 gr. sulphur. 



b. 0/J295 gr. gave 0, 1322 gr. metallic platinum. 



l ) Lang 1. c. p. 10. -) Reiset 1. c. p. 42' 



