ON THE ANTIMONY OXYCHLORIDES. 67 



the trichloride does not possess the composition Sb 4 Cl 2 5 , 

 but consists of ten molecules of this mixture and one of the 

 trichloride, which latter, however, can be removed by wash- 

 ing with either carbon disulphide or ether. Antimony-deter- 

 minations in two preparations gave (i) 75*45 per cent. Sb, 

 (2) 75 '88 per cent. Sb ; corresponding chlorine-determina- 

 tions gave (1) 12*43 P er cent CI, ( 2 ) I2 '49 P er cent. CI. 

 Hence we have 



Calculated for Calc. for 



10 Sb 4 Cl 2 5 +Sb Cl 3 . Sbj Cl 2 O.. Found. 



Sb 75*57 76-37 75" 66 



CI I2 "34 iiii 12-46 



O 12*09 1252 



By acting upon 1 5 parts by weight of antimony trichloride 

 with 1 part of trioxide in a sealed tube, Schneider (Pogg. 

 Ann. viii. 407) obtains a crystalline oxy chloride, to which 

 he assigns the formula 7 Sb Cl ? . Sb O CI. Repeating 

 Schneider's experiments, I obtained a pearl-grey crystal- 

 line mass melting at 7 2° C, the melting-point of the 

 trichloride. When acted upon by absolute alcohol, it 

 yields powder of algaroth (Sb + Cl z O s ) ; and its composition 

 appears to be even more complicated than that assigned to 

 it by Schneider. 



Antimony- determinations in two specimens gave (1) 

 54*24 per cent. Sb, (2) 54*16 per cent. Sb; whilst the cor- 

 responding chlorine-estimations were (1) 45*69, (2) 45*87, 

 instead of 55*08 per cent. Sb, and 44*62 per cent. CI, 

 required by Schneider's formula — but agreeing with the 

 formula Sb l6 Cl 46 0, which requires 54*2 per cent, of anti- 

 mony, and 45*35 per cent, of chlorine. 



The differences here found between the substances as 

 prepared by Schneider and myself may arise from the 

 admixture of antimony trioxide with the oxychloride in 

 the former preparation. When the tube in which the 

 substance has been prepared is placed in an upright posi- 



f2 



