Determination of Antimony. 347 



quantity of iodine contained in 1 cubic centim. of solution of 



iodine be called a, the quantity of antimony #= -^r (V—v)a. 



The following determinations show the applicability of the 

 method. 



(1) 0*200 grm. pure antimony-glance (from Arnsberg) were 

 directly measured. 



10 cubic centims. arsenical solution = 23*5 solution of 

 iodine. V = 235 cubic centims. v = 184*8 cubic centims. 

 a = 0-006 grm. 



From which #= 0*14625 grm. antimony. 



Calculated. Found. 



71*48 per cent, antimony 71*33 per cent. [ference. 

 28*52 „ sulphur 28*67 „ from the dif- 



100*00 100*00 



(2) 0*325 grm. pure antimony- glance was decomposed by hy- 

 drochloric acid, the strongly diluted solution was mixed with tar- 

 taric acid, the antimony precipitated by sulphuretted hydrogen, 

 and the sulphide of antimony measured. 



10 cubic centims. arsenical solution = 23*3 cubic centims. 

 solution of iodine. 



100 cubic, centims. arsenical solution were employed. 



V= 233 cubic centims. v = 151 cubic centims. a =0*006 grm. 



From which # = 0*239 grm. antimony. 



Calculated. Found. 



71*48 per cent, antimony 71*66 per cent. 



28*52 „ sulphur 28*34 v 



100-00 100*00 



(3) 0*407 grm. chemically pure antimony was dissolved in hy- 

 drochloric acid with the addition of some nitric acid • tartaric acid 

 was added, and the sulphide of antimony precipitated from the 

 diluted solution was measured. 



10 cubic centims. arsenical solution = 18*25 solution of 

 iodine. 



150 cubic centims. arsenical solution were taken. 



V=273*75 cubic centims. v = 160*5 cubic centims. « = 

 0*00758 grm. . . 



Taken. Found. 



0*407 0*4065 (=99*87 per cent.). 



It scarcely needs mention that this method may advantage- 

 ously be used in determining the sulphur in those compounds 

 which are decomposable by hydrochloric acid. 



Berlin, July 1860. 



H2 



