ANTIMONY. 227 



(I.) Percentage of S in SbjSg, 28.5385, zb .0023 



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



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



(4.) O needed to oxidize 100 parts Sb^Og, 10.953, ± -0075 



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



(6.) K^CrjO^ : tartar emetic : : 100 : 337.30, ± .29 



(7-) Agg : SbClg : : 100 : 70.512, ±: .021 



(8.) 3AgCl : SbClg : : 100 : 53.2311, zb .008 



(9-) Agg : SbBfg : : 100 : III.114, zb .0014 



(10.) 3AgBr : SbBrj : : 100 : 63.830, zb .008 



(11.) 3AgI : Sbig : : ico : 71.060, zb .023 



(12.) Cuj : Sb2 : : 100 : 128.259, zb .0077 



{13.) Agg : Sb : : 100 : 37.452, ± .0119 



(14.) Sbj : 3BaS04 : : 100 : 290.306, zb .0436 



In the reduction of these ratios a considerable number of antecedent 

 atomic weights are required, thus : 



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

 Ag= 107.108, zb .0031 Cu = 63. 119, zb .0015 

 CI = 35.179, zb .0048 Ba = 136.392, zb .0086 

 Br = 79-344. =b .0062 Cr = 51-742, zb .0034 



1 = 125.888, zb .0069 AgCl = 142.287, ± .0037 

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

 S = 31.828, zb .0015 Agl = 232.996, zb .0062 



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

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

 be combined, as follows : First, for the chloride — 



From (3) SbClg = 225.894, db .0771 



From (7) " ^= 226.572, zb .0678 



From (8) " ^ 227.223, zb .0347 



General mean SbClg ^ 226.924, zb .0286 



Hence Sb = 121.387, =t .0321. 

 For the bromide we have — 



From (9) SbBrg = 357.036, =b .0113 



From (10) " = 357.037, zb .0250 



General mean SbBfg = 357.036, zb .0103 



Hence Sb = 119.005, ± .0212. 



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

 below in the order of their magnitude : 



