36 P. T. CLEVE, 



4. Nitrate 2N0 2 . L <Ptr NH 3 ' ON0 2 was prepared by Gerhardt x ) by the action of 



nitric acid upon the basic nitrate (N:o 5). The compound was obtained by me in the 

 same manner in colourless or slightly yellowish needles, which when examined with 

 the microscope were found to be well developed, four-sided and obliquely truncated 

 prisms. 



Analysis: the nitrate dried at 100°. 



a. 0,2625 gr. gave 0,1075 gr. metallic platinum. 



b. 0,3670 gr. gave by combustion with chromate of lead 0,0520 gr. water or 0,00578 

 gr. hydrogen. 



c. 0,2925 gr. gave 42,5 C. C. nitrogen (temp. of the water 16°. Barom. 770 m. m. 

 t. 19°) or 0,05003 gr. nitrogen. 



The resnlt of the analysis compared with the figures calculated from the formula, 

 are as follows: 



Theory Found 



Gerhardt Cleve 



Platinum 197,88—41,22 41,17 — 41,25 40,95 (a) 



Nitrogen 84,ou — 17,15 17,42 — 17,11 (c) 



Hydrogen 6,00 — 1,25 1,40 — 1,57 (b) 



Oxygen 192,oo— 40 ,oi 39,85 — 40,37 (loss) 



479,88 100,oo 100,oo 100,oo 



The nitrate is soluble in boiling water, assumes a slightly yellow eolour, and re- 

 crystallises without decomposition on cooling the solution. If the nitrate is boi- 

 led with a solution of ehloride of potassium, it yields the chloride of platinammine, 

 but the decomposition proceeds very slowly. When hydrochloric acid is added to the 

 hot solution, yellow octahedrons of the chloride of platinammine, mixed with colourless 

 prisms of the undecomposed nitrate, are crystallised on cooling. 



5. Nitrate bibasic 2HO . Pt NH 3 N0 2 + 2H,0. Gerhardt"), has described this 

 compound as the neutral nitrate of liis platinammine. I have prepared the compound 

 in the same manner as Gerhardt by boiling the chloride of platinammine with nitrate 

 of silver. The compound is of a whitish yellow eolour, and examined with the micro- 

 scope it seems to crystallise in rhombic or hexagonal tablets. 



Analysis the nitrate dried at 100°. 



a. 0,5175 gr. gave 0,2430 gr. metallic platinum. 



b. 0,2455 gr. gave 27,5 C. C. nitrogen (temp. of the water 17°. Bar. 773 m. m. 

 t. 17) or 0,0323 gr. nitrogen. 



c. 0,2905 gr. gave 0,0825 gr. water or 0,00917 gr. hydrogen. 



') Gerhardt Ann. der Ch. u. Pharm. 76. 1850. p. 310. 

 2 ) Gerhardt 1. c. p. 309. 



