18 M. Berzeliiis 07i Vanadium. 



in water; the solution is yellow, and deposits, by spontaneous 

 evaporation or with heat, small red crystalline grains. 



Vanadate of Iron. — This salt is a precipitate of a deep 

 grayish-brown colour, which so little resembles the vanadates 

 in general, that it may be a subpervanadite. Muriatic acid 

 dissolves it, and the solution is green. 



Bivanadate of Iron is a precipitate of a deep green colour, 

 which soon changes ; the solution becomes green, and the pre- 

 cipitate grayish, and in twenty-four hours it has a crystalline 

 appearance. 



Pcrvanadatc of Iron. — This is a light precipitate of a straw- 

 yellow colour ; it dissolves in small quantity in water, so that 

 the portions lirst precipitated redissolve when the liquid is 

 stirred. 



The Bivanadate precipitates of the same colour, but in a 

 short time it assumes a crystalline appearance. 



Vanadate of Cobalt precipitates of a yellowish coloui". — 

 The bivanadate is soluble. Alcohol precipitates it in the state 

 of a dirty yellow powder. 



Vanadates of Nickel. — The neutral and the bisalt are both 

 soluble ; alcohol precipitates them of a dirty yellow colour ; the 

 precipitate from the bisalt is brownish. Their aqueous solutions 

 are yellow, and leave by evaporation a crystalline mass of a 

 dirty yellow colour ; that from the bisalt is composed of small 

 yellow prismatic crystals. Ammonia does not form a blue 

 solution with it. 



Vanadate of Cadmium. — A nearly white precipitate, inso- 

 luble even in boiling water, is immediately formed. Another 

 portion is deposited, after some time, in small grains. The 

 bisalt is soluble. 



The jjroio- and the x>cr-vanadate of tin are soluble. 



Vanadate of Lead. — A yellow gelatinous precipitate, which 

 contracts and becomes white in a few hours. The bivanadates 

 poured into a solution of acetate of lead, precipitate merely 

 a neutral salt, when the salt of lead is in excess. When the 

 precipitate is washed, the water is always of a yellow colour, 

 and dissolves sensible quantities, even of the subsalt. The 

 vanadate of lead is very fusible, and becomes reddish yellow 

 by fusion. Nitric acid, whether warm or cold, dissolves it 

 without acquiring any colour. But if the solution be heated 

 to boiling, it deposits a brown mass, which is a supersalt with 

 great excess of vanadic acid. 



The bisalt is precipitated from a solution of nitrate of lead, 

 when bivanadate of potash is poured into it. It is of a fine 

 yellow colour, which suffers no change. The carbonates of 

 potash and soda do not decompose the vanadate of lead, even 



at 



