1867.] 



Prof. Roscoe on Vanadium. 



227 



cess and by ordinary weight analysis. Nine volumetric analyses gave 6 1 '306 

 per cent, of chlorine; seven gravimetric determinations gave 61 '241 per 

 cent. From these numbers an atomic weight of 5 1 '0.5 for vanadium is 

 obtained. The mean of 5 rOo and 5 1-37, the number which the reduction ex- 

 periments yieldedj'viz. 51*21, is taken as the true atomic weightof vanadium. 



The vanadium in this chloride was determined as pentoxide. The result 

 of the analyses is as follows : — 



Calculated. Found. 



Y = 51-2 29-55 29*58 



Cl3= 106-11 61-24 61-27 



O = 16-0 9-21 



173-31 100-00 



(2) Vanadium Oxydichloride, or Vanadyl Bichloride, NOQ,\^= 137-9. 

 This substance is a light green crystalline sohd body, obtained by the action 

 of zinc on the trichloride at 400° in sealed tubes. It has a specific gravity 

 of 2*88, is insoluble in water, but deliquesces on long exposure to air, and 

 dissolves easily in acids. Analysis gave 



Calculated. Found. 



y 37-13 37-58 



CI, 51-27 50-73 



O 11-60 



100-00 



(3) Vanadium Oxy mono chloride, or Vanadyl Monochloride, yOCI= 

 102-57. This body is a brown, light, powdery solid, formed by the action 

 of hydrogen upon vanadyl trichloride at a red heat. It is insoluble in 

 water, but readily soluble in acids. Analysis gave 



Calculated. Found. 



Y 49-96 50-21 



CI 34-45 34-53 



O 15-59 



100-00 



(4) Divanadyl Monochloride, Y^O^Cl = 169-8. This oxy chloride is 

 also formed by the action of hydrogen at a red heat on YOCI3. It can 

 readily be separated from the foregoing compound, as it is a heavy, 

 shining, metallic powder, resembling '* mosaic gold" in its appearance. 

 Analysis gave 



Calculated. Found. 



Y, 60-37 61-69 



CI 18-82 18-93 



O, 20-81 — - 



100-00 



