6 



The simplest formula agreeing with the analytical numbers 

 is SbgOiClp or three molecules of antimony pentachloride in 

 which four atoms of oxygen replace eight of chlorine. 



Calculated. Found. 



Sbg 58-94 58-89 



CI; 86-62 86-58 



O, 9-44 ..c... 



100-00 



From the above results it is clear that the simple 

 phosphorus oxychloride is not reproduced under similar 

 circumstances in the antimony series, but that this element 

 in agi-eement with its general depoi'tment gives rise to more 

 complicated compounds, 



The oxychlorides derived from antimony trioxide have 

 been frequently examined; the results of the analyses of 

 powder of algaroth made by different investigators varies 

 considerably, and Sabanejeff has recently shown that these 

 differences are probably due to the presence in the substance 

 of antimony trichloride in varying quantities. This impu- 

 rity he gets rid of by washing the oxychloride obtained by 

 the action of a lai-ge excess of water on the trichloride with 

 ether or carbon disulphide in which the trichloride dissolves. 

 In this way he obtains a compound having the constant 

 composition Sb^ClaOs; or two molecules of trioxide in which 

 one of oxygen is replaced by two of chlorine, whilst a simpler 

 monoxy chloride SbOCl is prepared by acting with only from 

 2 to 10 molecules of water on the trichloride. But this on 

 treatment with ether or carbon disulphide loses trichloride 

 and yields Sb.ClA; thus 5 SbOCl ^SbClg+SbAOs. 



The results of my experiments lead me to the conclusion 

 that the body obtained by the action of boiling water on 

 the trichloride does not possess the composition SbiCljOj, 

 but consists of 10 molecules of this substance and one of the 



