ON AMMONIACAL PLATINUM BASES. 43 



Analysis : 



a. 0,4040 gr. gave 0,2620 gr. inetallic platinum and 0,3860 gr. chloride of silver = 

 0,ou54 gr. chlorine. 



b. 0,2444 gr. gave 20, i C. C. nitrogen (temp. of the water 16° Bar 750 t. 21°) = 

 0,0230 gr. nitrogen. 



c. 0,3950 gr. gave 0,o?60 gr. water =0,0084 gr. hy drogen. 



The formula requires: 



Calculated Found 



Platinum 197,88 — 65,35 64,85 (a) 



Chlorine 70,92—23,42 23,61 (a) 



Nitrogen 28,oo — 9,25 9,41 (b) 



Hydrogen 6,oo — 1,98 2, 12 (c) 



302,80 100,oo 99,99 



The chloride is decomposed by salts of silver and then gives salts of platoseini- 

 diammine and chloride of silver. If one mol. of the chloride is decomposed with only 

 half of the quantity of nitrate of silver, which it requires for a complete decompo- 

 sition, no chloronitrate is obtained, but a mixture of the chloride and the nitrate of 

 the basis. 



Cyanide of potassium in excess evolves ammonia with the chloride and gives flu- 

 orescent needles of platocyanide of potassium. 



Sulphurous acid led through the boiling solution of the chloride throws off a 

 part of the chlorine and yields colourless, easily soluble crystals of an acid chloro- 

 sulphite. 



Sulphite of sodium boiled with the chloride gives tine white needles of the sul- 

 phite of Litton and Schnedermann *) 



«(2::S5SSH + »* - 



The compound dried at 100° gave by analysis: 



a. 0,3990 gr. gave 0,1165 gr. metallic platinum and 0,5470 gr. sulphate of barium = 

 0,0751 gr. sulphur. 



b. 0, 1600 gr. gave 0,1350 gr. platinum and 0,2820 gr. sulphate of sodium — 0,0913 

 gr. sodium. 



The formula requires: 



Theory Experiment 



a b 



Platinum 28,98 29, 20 29,34 



Sulphur 18,74 18,80 — 



Sodium 20,21 — 19,85 



Chlorine or Nitro-muriatic acid gives, with the chloride of platosemidiammine, the 

 chloride of platinsemidiammine, crystallising in hexagonal or rhombic microscopical 

 scales. 



l ) Litton & Schnedermann Ann. der Ch. u. Pharm. 42. 1842. p. 316. 



