PROFESSOR EOSCOE’S RESEARCHES ON VANADIUM. 
25 
Hence we have as the composition of this substance : — 
Calculated. 
Found. 
V 
= 51-3 
37T2 
37-58 
Cl 2 
= 70-91 
51-39 
50-73 
0 
= 16-0 
11-59 
— 
138-21 
100-00 
3. Vanadium Oxymonochloride , or Vanadyl Monochloride, V O Cl=102-76. — Vanadyl 
monochloride is a brown, light, powdery solid, formed by the action of hydrogen upon 
vanadyl trichloride. It is obtained by passing the vapour of the trichloride together 
with hydrogen through a red-hot tube, and is deposited at the end nearest to the point 
where the trichloride enters the tube. It is insoluble in water, but easily soluble in 
nitric acid. It may readily be distinguished and separated from the preceding and fol- 
lowing oxychlorides by its appearance and light flocculent nature. The analysis was 
made in the manner already described, the substance being dried at 130° in a stream of 
carbon dioxide till its weight was constant. 
Percentages 
Nos. 
Weight of substance 
taken. 
Weight of silver 
chloride found. 
Weight of vanadium ( A ^ 
pentoxide found. of chlorine, of vanadium. 
1 . 
0-1393 
0-1823 
0-1240 
32-35 50-03 
2. 
0-2631 
0-3912 
0-2285 
36-71 48-82 
Hence 
we have — 
Calculated. 
Found. 
V = 
51-3 
49-92 
50-21 
Cl= 
0 = 
35-46 
16-0 
34-51 
15-57 
34-53 
102-76 
100-00 
4. Divanadyl Monochloride, V 2 0 2 C1=170‘06. — This substance is likewise formed hi 
a similar manner to the foregoing oxychlorides. It has a bright, shining, metallic lustre 
and a brownish-yellow colour, closely resembling the tin disulphide known as “ mosaic 
gold.” This substance is always deposited in the portion of the heated tube furthest 
from the trichloride, and it adheres firmly to the glass. From its heavy coherent nature 
it can easily be separated from the preceding compound. Under the microscope it is 
seen to consist of brilliant-yellow metallic crystals, and it has been mistaken for metallic 
vanadium by Schafarik. 
It is insoluble in water, but dissolves like the other solid oxychlorides easily in nitric 
acid. The brown shining crystals were heated in carbon dioxide at 1 40° until their weight 
was constant, and then they 
were analyzed 
as above described. 
Percentages 
Weight of substance 
Nos. taken. 
Weight of silver 
chloride found. 
Weight of vanadium 
pentoxide found. 
A. - 
of chlorine, of vanadium. 
1. 0-2130 
0T777 
0-2443 
19-72 64-48 
2. 0-6098 
0-4767 
0-6390 
18-15 58-91 
MDCCCLXYIII. 
E 
