20 



P. T. CL EVE. 



8. Nitrate R . 0> . 2NO L , was obtainecl by Reiset l ) by double decomposition of the 

 jodide with nitrate of silver. I have prepared the nitrate in the same manner, and 

 also employed the chloride. By spontaneous evaporation of the solution in a warm 

 place the nitrate is obtained in form of light yellow crystalline crnsts. They are to- 

 lerably easily soluble in warm water, but dissolve very slowly. Under the microscope 

 the crusts seem to be composed of small needles. 



Analysis, the nitrate dried at 100° C. 



a. 0,4679 gr. gave 0,2590 gr. raetallic platinum. 



b. 0,2409 gr. gave 33 C. C. nitrogen (temp. of the water 15°. Bar. 747 m.m. t. 

 20°) =0,0377 gr. nitrogen. 



c. 0,4055 gr. gave 0,0655 gr. water = 0,0073 gr. hy drogen. 



The formula Pt . 2NH :( . O, . NO, requires: 

 Galculated 



a 



55,35 



Found 

 b 



C 



by Reiset 

 55,40 — 55,45 



— 



15,G5 



— 



15,64 



— 







1,79 



(27,21) 







Platinum 197,88 — 55, oo 



Nitrogen 56, oo — 15,74 



Hy drogen 6,oo — 1,69 



Oxygen 96,oo — 26,97 



355,88 100 ; oo 



The reactions of the nitrate of platosammine are as follows: 



Chloroplatinate of sodium produces in the solution of the nitrate a dark brown 

 or almost black coloration and deposist small glittering yellow crystals, which exhibit 

 the form of the chloride of platinammine in the microscope. They are mixed with a 

 darkgreen precipitate in small quantity. They yellow crystals were analysed, without 

 having been purified by recrystallisation. 

 The analysis gave: 



Platinum 54,90 



Chlorine 35, oo 



Aminonia (loss) 9,44 



100,oo 



and the formula Pt . 2NH3 . 4C1 requires: 



Platinum 52,95 



Chlorine 37,96 



Ammonia 9,09 



100,00 



The difference between the numbers found and calculated is explained by the 

 presence of impurities. In colour and form of the crystals the yellow product agrees 



2 ) Eeiset Ann. de Ch. et de Phy*. (3) 11. 1*44. p. 426. 



