<>N AMMONIACAL PLATINUM BASES. 25) 



The compound dried at 100° still contains one malecule water. 



25. Sulphite of le ad and platosammine R^ osoo , Pb +H 2 0. By mixing the solu- 



tions of nitrate of lead and the ammonio-sulphite a snow-white crystalline precipitate is 

 irnmediately thrown down. The precipitate dried at 100° was mixed with sulj)huric 

 acid and ignited. 



0,3950 gr. thus treated gave 0,322a gr. platinuin + sulphate of lead, which, calcu- 

 lated in 100 parts, is 81,64. The formula requires 81,20. 



On adding mercuric chloride to the solution of the ammonio-sulphite, a white preci- 

 pitate of small shining quaclratic scales Avas obtained, but this compound did not con- 

 tain platinum. 



A fact worth notice is that all the donble sulphites, except the salt of ammonium, 

 contain water, which is not easily löst. 



26. Oxide anhydride RO ? According to Reiset l ) the hydrate of platodiam- 

 mine, when heated to 170° gives one molecule water and two mol. ammonia. The re- 

 siduum is a white matter, insoluble in water and ammonia. The analysis of Reiset 

 agrees with the formula given above, but it is not at all improbable, that the compo- 

 und has another atoraical composition, as, according to Reiset, the anhydride gives 

 with acids fnlminating salts. I have not examined the product. 



The formulas for all the known compounds of platosammine are as follow: 



. R==Pt /NH, 



^ rt \NH £ 



1. Chloride RC1, 



2. Bromide RBr 2 



3. Jodide RL 



4. Cyanide RCy 2 



5. Platocyanide RCy 4 Pt 



6. Sulphocyanate R(CyS) 2 



7. Silfver-sulphocyanate R(CyS) G 2Ag 2 



8. Nitrate R . 2N0 3 



9. Nitrite R . 2NO, 



10. Platonitrite R . 4NO, . Pr 



11. Sulphate R.S0 4 + H 2 



1 2. Bioxalate R . O, . 2(C 2 2 ) . 2 H 2 +2H 2 



13. Sulphite R.S0 3 +H 2 Ö 



i Cl 



14. Acid chloro-sulphite R| so 0H 



{Cl 

 O SO O NH + H O 



16. Double sulphite of ammonium R"\ S o o nb~ 4 



17. Double sulphite of silver Rj 0S00 (Ag 2 +H 2 () 



l ) Reiset Ann. de Chera et de Phys. (3) 11. 1844 p. 423. 



