306 



SMITIISOXIAX MISCELLANEOUS COLLECTIONS 



VOL. 54 



Upon the oxychloride, VOCla. two series of experiments were made — 

 one volumetric, the other gravimetric. In the volumetric series the com- 

 pound was titrated with solutions containing known weights of silver, 

 which had been purified according to the methods recommended by 

 Stas. Eoscoe publishes his weighings, and gives percentages deduced 

 from them; his figures, reduced to a common standard, make the quan- 

 tities of VOCL, given in the third column proportional to 100 parts of 

 silver. He was assisted' bv two analvsts: 



.039 



The gravimetric series, of course, fixes the ratio between YOCI3 and 

 AgCl. If we put the latter at 100 parts, the proportion of VOCI3 is as 

 given in the third column : 



Analyst A. 

 1.8521 grm. VOCI3 gave 4.5932 grm. AgCl. 



.7013 

 .7486 



1.4408 

 .9453 



1.6183 



1.7303 

 1.8467 

 3.5719 

 2.3399 

 4.0282 



40.323 

 40.531 

 40.537 

 40.337 

 40.399 

 40.174 



2.1936 grm. VOCI3 

 2.5054 



Analyst B. 

 ?ave 5.4039 grm. AgCL 40.391 



6.2118 " 40.333 



Mean, 40.378, ± .028 



These two series give us two values for the molecular weight of VOCI3 : 



From volumetric series VOCI3 = 173.426, ± .1262 



From gravimetric series " = 173.631, ± .1204 



General mean VOCI3 = 173.532, 



.0871 



Hence V = 51. 157, ±.0872, when Ag= 107.880 and 01 = 35.4584. 

 From the oxide, V = 51. 381, ±.0220. The two values combined give 

 V = 51.367, ±.0214. 



