64 



MR. WILLIAM CARLETON WILLIAMS 



specimens of the oxy chloride, melting at 85 , which were 

 prepared on different occasions : — 



(A.) Antimony -determinations. 



Prepara- 

 tion. 



Me- 

 thod. 



Weight of 



substance 



taken. 



Total wt. 



sulphide 



+ sulphur. 



Do. taken 

 for oxida- 

 tion. 



Sb 2 4 

 found. 



Percent. 



of 

 antimony. 



No. 1. 

 No. 1. 

 No. 2. 



No. 2. 

 No. 3. 



1. 

 1. 

 1. 



2. 

 1. 



0.9940 



Q'4455 

 0*2490 



0*6225 



0-4630 



1*416 

 0*299 

 0168 



0-483 

 o*345 



1*2980 

 0-2460 

 0-1240 



0*3070 

 0-2815 



0*500 

 0*2005 

 0.1005 

 (metal) 

 0*172 

 0*2085 



4347 

 43-34 

 43-37 



43'47 

 43*67 



Mean of five antimony-determinations, 43*46 per cent. Sb. 



(B.) Chlorine-determinations. 



The chlorine was estimated (1) in the tartaric acid solu- 

 tion of the substance by the method above described, and 

 (2) in the filtrate after precipitating the antimony with 

 sulphuretted hydrogen. 



Prepara- 

 tion. 



Weight of 



substance 



taken. 



Weight of 

 Ag CI pre- 

 cipitated. 



Wt. of Ag CI 

 taken for 

 reduction. 



found. 



Percent. 



of 

 chlorine. 



1. 

 1. 

 1. 



2. 



3* 



0*3975 

 0*3405 



0*3630 



o-7385 

 0*3630 



o*88i 



0758 



0-796 



16325 



0-798 



0-848 



0-714 

 o*oo6 

 0-0065 

 0*006 



0*6370 

 o-5355 



54 - 72 

 54*88 



54' 6 5 

 54-7I 

 54-79 









Mean of five chlorine-determinations, 5475 percent. CI. 



The simplest formula which agrees with these results is 

 Sb ? CI, ? O, or three molecules of pentachloride in which 

 two atoms of chlorine are replaced by one of oxygen. 



Calculated. Found. 



Antimony 43-39 43-46 



Chlorine 54*7* 54*75 



Oxygen 1-90 



That this is a definite compound, and not a mere mix- 

 ture of pentoxide and pentachloride (Sb 2 5 -4- 14 SbCl 5 ), 

 is evident from the fact that the latter substance is not 



