no THE ALUMNI JOURNAL 



In the volumetric assay, only the antimonous oxide reacts 

 with the decinormal iodine solution. Antimonic oxide was found 

 in this as well as all other samples. It was identified by warming 

 the solution of the salt, acidified with hydrochloric acid, with a few 

 drops of a solution of potassium iodide, whereby iodine was lib- 

 erated. No quantitative estimation could be made, owing to the 

 difficulty in distinguishing the color change, the quantity of lib- 

 erated iodine being very small. 



The gravimetric estimations averaging 37.19 per cent, of Sb are 

 approximately i per cent, higher, if figured on tartar emetic, than 

 those of the volumetric method which averaged 36.94 per cent. 

 This may be accounted for through the presence of small quantities 

 of the antimonic salt. Our present method of assay may be modi- 

 fied either in lowering the Rubric or the number of Cc. of iodine 

 V. S. required, setting thereby a limit to the antimonic content. 



Titrimetric estimation of commercial samples gave the following 

 results : 



