8 M. Berzelius on Fatiadium. 



ride; but it burns in its vapoui*. Muriatic acid dissolves 

 vanadic acid, becomes green and evolves chlorine. Perchlo- 

 ride of vanadium absorbs ammoniacal gas and becomes very 

 hot. The compound may be sublimed and forms a white 

 iincrystalline powder. When heated in a current of ammo- 

 niacal gas, it is decomposed below a red heat, muriate of am- 

 monia is formed, azotic gas is evolved and the vanadium is re- 

 duced, as has been already stated. 



Periodidc of Vanadium. — Vanadium and iodine combine 

 with difficulty in the dry way. I have heated it to redness in 

 the vapour of iodine, without any appearance of combination. 

 There did indeed sublime a small quantity of an orange-co- 

 loured fused substance, which became solid on cooling and 

 of a straw colour. It was difficultly soluble in water. I can- 

 not state positively that this substance was periodide; for 

 when the perchloride is prepared, a small quantity of a similar 

 substance sublimes, which is merely vanadic acid, the forma- 

 tion of which is occasioned by the presence of a small quantity 

 of air or moisture. 



Perjiuoride of Vanadium. — Fluoric acid dissolves vanadic 

 acid when heated. The solution is colourless, and when it is 

 evaporated at a temperature not exceeding 104° Fahrenheit, 

 it leaves a solid white mass which redissolves in water. When 

 exposed to a higher temperatui'e, the salt becomes red, but 

 still it is soluble in water ; but when more strongly heated, it 

 gives out fluoric acid and leaves vanadic acid. A niixtui'e of 

 vanadate of soda and fluoride of vanadium, distilled in a 

 platina retort with fuming sulphuric acid, gives merely fluoric 

 acid, and all the vanadic acid is found combined with the acid 

 sulphate formed. 



Silicio-perfuoride of Vanadium. — Fluosilicic acid dissolves 

 vanadic acid ; the solution has a red colour. After evapora- 

 tion in a salt-water bath, an uncrystalline orange-coloured 

 mass remains; this is partially soluble, and the solution is of a 

 pale yellow; but a great portion remains undissolved in the 

 state of a deep green-coloured mass, which is dissolved by 

 sulphuric acid with the disengagement of fluosilicic acid gas, 

 and the formation of a red liquid. 



Pcrferrocyanide of Vanadium. — This is a precipitate of a 

 fine green colour. Those substances which readily reduce 

 the persalts of vanadium, easily render it yellow. It is also 

 formed when the protoferrocyanide of vanadium is exposed to 

 moist air; but in this case it is a subcyanide. 



The persalts of vanadium are either red or yellow. Their 

 taste is strongly astringent, like that of the salts of iron, and 

 at the same time subacid. The neutral salts, dissolved in 



water 



