332 M. Berzelius on Vanadium. 



rate lieat, it is entirely converted into this brown mass, which 

 is a subchloride. It gives no a}ipearance of crystallization. 

 Concentrated chloride of vanadium may be mixed with ab- 

 solute alcohol without precipitation. Ammonia occasions a 

 greenish gray precipitate, which may be washed without dis- 

 solving, and which appears to be a subchloride containing 

 ammonia. 



Bro7nide of Vanadhim. — This salt resembles the blue chlo- 

 ride in all respects. Hydrobromic acid dissolves anhydrous 

 oxide of vanadium, the solution is blue. The concentrated 

 bromide, mixed with absolute alcohol, becomes in a few se- 

 conds gelatinous, because the alcohol seizes the water ; but it 

 becomes liquid in proportion as the alcohol evaporates. When 

 dried it becomes brown, but it redissolves almost entirely in 

 water. Ammonia precipitates a greenish gray double chloride. 



Iodide of Vanadium. — Its solution is blue like that of the 

 preceding salts, but it becomes quickly green in the air. By 

 spontaneous evaporation it becomes a semi-fluid brown mass, 

 which when diluted is of a blackish brown colour. Sulphuric 

 acid then disengages iodine. It appears to contain a mixture 

 of vanailate of vanadium and of ioduretted iodide of vanadium. 

 I have not examined it very minutely. 



Fluoride of Vanadiuvi. — In solution it is blue, and when 

 dried brown, and redissolves in water. By spontaneous eva- 

 poration it becomes greenish and of a syru}iy consistence, and 

 greenish crystals are formed. In this state it is soluble in 

 absolute alcohol, which does not restore its original blue co- 

 lour ; sul}ihuretted hydrogen easily produces this effect. This 

 fluoride combines with the alkaline fluorides, with which it 

 forms salts of a light blue colour, very soluble in water, but 

 not in alcohol. 



Fluo-silicate of Vanadium. — The solution is blue; when eva- 

 porated at H0° Fahrenheit it gives a spongy light blue co- 

 loured mass. By evajioration it becomes green, and resembles 

 the fluoride. 



Cyanurct of Vanadium. — When hydrate of vanadium is 

 treated with hydrocyanic acid, it becomes brown, anil it may 

 be washed without becoming green or dissolving. I afterwards 

 treated it with cyanuret of potassium ; it dissolved, but the 

 solution left to spontaneous evaporation only gave vanadate of 

 potash, exhaling at the same time the odour of hydrocyanic 

 acid. The fen-ocyanate of vanadium precipitates in a bulky 

 mass, of a fine lemon colour with a greenish tint. It is not 

 soluble in diluted acids; by exposure to the air it becomes of 

 a fine green ; the perferrocyanate ol vanadium precipitates in 

 a gclalinou:^ mass of a yellowish green. 



Sxdphalc 



