54 P. T. CLEVE, 



black chloride, probably of the formula Pt_. 2NH 3 . 2NET. . Cl,., and almost insoluble in 

 water. This black chloride, when heated with hydrochloric acid, slowly produces the 

 chloride of platosemidiammine. With the hydrate nitric and sulphuric acids give black 

 uncrystalline compounds, probably having the formulas: 



Pt,2NH 3 .2NH 2 .0,.2NO ä 



Pt,2NH 3 . 2NH, .0, .SO, . 

 From these facts it may be deduced, that by the action of soda-lye on the chlo- 

 ride of platosemidiammine a hydrate is formed, which is two-atomic. If its formula is 



written thus Pt"J NH 3 ^ NH 3 ' OH +H,0 it bas two atoms of hydrogen more than the previous 



formula, which cannot, however be the right one. Against it there are three circum- 

 stances: l:o The hydrate yields, with hydrochloric acid, the chloride of platosemidiam- 

 mine. If the formula were right hydrogen would be evolved or a reduction take place 

 but I observed nothing of the kind. 2:o By boiling the chloride of platosemidiammine 

 I have not been able to discover any other products containing platinum than the hy- 

 drate, and possibly also dissolved in the liquid, the unknown hydrate of platosemidi- 

 ammine. If the formula were correct the formation of the hydrate may be represented 

 by the equation: 



2Pt{^ H ' CI + 4Na.O.H^(Pt^;;^ + H,0) + 4NaCl + 0. 



According to the equation one atom of oxygen might be freed and would pro- 

 bably produce an oxydising action, which I was unable to find. 0:0 If boiled with 

 nitro-muriatic acid, the hydrate yields a chloride containing but four atoms chlorine, 

 not six, as one would previously expect, if the formula were right. 



All difriculties are obviated if the formula for the hydrate is written in the fol- 

 lowing manner: 



|0H 

 loH 



This formula only requires four atoms of hydrogen less than the first one. The 

 formation of the produet by the reaction of sodium-hydrate upon the chloride of plato- 

 semidiammine may then be expressed as follows: 



|0H 



l ) + 4(Na.O.H) = 4NaCl,p;p : ^ : ^>0 + HX) 



lOH 



The formation of a chloride with four atoms of chlorine is also easily intelligible. 

 The formation of the chloride of platosemidiammine by the action of hydrochloric acid, 

 is of the same kind as the formation of the iodo-chloride of platindiammine (Pt . 4NH 3 . 

 I . Cl, 1 ) by the action of hydrochloric acid upon the iodonitrate of diplatindiammine, 



Ptj8NH 3 .4N0 3 . 





«' 



») Cleve K. Vet.-Ak. Haiull. K. 7. N:o 7, p. 10. 



