ANTIMONY. 227 



(i.) Percentage of S in Sb 2 S 3 , 28.5385, .0023 



(2.) Percentage of Sb in Sb 2 O 4 , 79.283, .009 



(3.) O needed to oxidize 100 parts SbCJ 3 , 7.0294, .0024 



(4.) O needed to oxidize 100 parts Sb 2 O 3 , 10.953, -O75 



(5.) O needed to oxidize 100 parts Sb, 13.079, Hh .0096 



(6.) K 2 Cr 2 O 7 : tartar emetic : : 100 : 337.30, .29 



(7-) A Ss ' SbCl 3 : : 100 : 70.512, .021 



(8.) 3AgCl : SbG 3 : : 100 : 53.2311, .008 



(9-) A 3 ' SbBr 3 : : loo : 111.114, .0014 



(10.) 3AgBr : SbBr 3 : : loo : 63.830, .008 



(11.) 3AgI : SbI 3 : : 100 : 71.060, .023 



(12.) Cu 3 : Sb 2 : : 100 : 128.259, .0077 



( T 3-) A 3 = Sb : : 100 : 37.452, .0119 



(14.) Sb 2 : 3BaSO 4 : : 100 : 290.306, rb .0436 



In the reduction of these ratios a considerable number of antecedent 

 atomic weights are required, thus : 



= 15.879, + .0003 C = 11.920, .0004 

 Ag = 107.108, .0031 Cu = 63.119, .0015 

 cl =:: 35-179, .0048 Ba = 136.392, .0086 

 Br == 79-344, .0062 Cr = 51.742, .0034 



1 = 125.888,^.0069 AgCl = 142.287, .0037 

 K = = 38.817, .0051 AgBr=r 186.452, .0054 

 S ;= 31.828,^.0015 Agl =232.996,^3.0062 



Three of the ratios give the molecular weight of antimony trichloride, 

 and two give corresponding values for the bromide. These values may 

 be combined, as follows : First, for the chloride 



From (3) SbCl 3 = 225.894, .0771 



From (7) , " = 226.572, .0678 



From (8) " = 227.223, dr .0347 



General mean SbCl 3 = 226.924, .0286 



Hence Sb = 121.387, dr .0321. 

 For the bromide we have 



From (9) r. SbBr 3 357.036, .0113 



From ( 10) " = 357.037, .0250 



General mean SbBr 3 = 357.036, .0103 



Hence Sb = 119.005, .0212. 



All the data yield eleven values for antimony, which are arranged 

 below in the order of their magnitude : 



