M. Berzelius on Vanadium. 17 



Bivanadate of Sfronlia is prepared in tlie same way as, 

 and resembles, the vanadate of barytes. 



Vanadate of Lime. — This salt is still more soluble than the 

 vanadate of strontia. It is obtained by evaporating, widi a 

 gentle heat, a mixture of nitrate of lime and vanadate of am- 

 monia. It forms a white crystalline crust. Alcohol precipi- 

 tates it with difficulty from solution. 



^ Bivanadate of Lime. — This is very soluble in water, and 

 yields, by spontaneous evaporation, large crystals of a fine 

 orange red colour, which resemble those of bivanadate of soda, 

 but they do not effloresce. 



Vanadate of Magnesia. — This salt is soluble in water to the 

 same extent as the vanadates of the fixed alkalies. The solu- 

 tion, when concentrated to the consistence of a syrup, gra- 

 dually forms crystals radiating from a centre, in the same way 

 as vanadate of lithia. 



Bivanadate of Magnesia is less soluble than the neutral vana- 

 date, and leaves, after spontaneous evaporation, small yellow 

 crystalline flakes. Alcohol precipitates it from solution ; it re- 

 mains however coloured, and is not rendered turbid by a fresh 

 portion of alcohol. 



Vanadates qf Alumina, Glucina and Ytti-ia. — The neutral 

 salts of these earths, as well as the bisalts of the first two, form 

 yellow precipitates, which by washing are dissolved in suffi- 

 cient quantity to colour the water yellow. Bivanadate of 

 ytti'ia is soluble in water and does not precipitate. 



Vanadate ofZirconia. — The neutral and bisalt are soluble 

 in water; consequendy the vanadates do not precipitate neu- 

 tral salts of zirconia. 



Vanadate of Tfwrina. — A yellow precipitate which does 

 not dissolve, even when the liquor from which it is precipi- 

 tated is heated; the bisalt is soluble in water. 



Vanadate of Manganese. — In order to prepare this salt, as 

 well as some other soluble metallic vanadates, the metallic 

 chloride is to be dissolved in water, and vanadate or bivana- 

 date of potash is to be added, taking care to have an excess 

 of the chloride in the liquor, and adding alcohol. The pre- 

 cipitate is usually of an ochre yellow colour, which is to be 

 washed with alcohol, then dissolved in water and crystallized 

 by spontaneous evaporation. Vanadate of manganese is formed 

 In small crystals which are of so deep a brown that they a})jiear 

 black. The solution is yellow. This salt is not very soluble 

 in cold water. 



Bivanadate of Manganese, precipitated by alcohol, resem- 

 bles the neutral vanadate in appearance; it dissolves sparingly 



N.S. Vol. U. No. Gl. Jan. 1832. I) in 



