Vanadic acid, meta

Silver orthovanadate reacts with alkyl halides to give esters of vanadic acid. These are yellow liquids of general formula Alk.3V04, in which Aik. represents the alkyl radical. Esters of orthovanadic acid axe more stable than those of pyro- and meta-vanadic acids that is, the order of stability is the reverse of that which applies to the inorganic salts.3 The following orthovanadates have been prepared —... 

AI3-51890 CCRIS 6881 EINECS 237-272-7 Meta-wanadan sodowy Monosodium trioxovanadate(l-) Northovan NSC 79535 Sodium metavanadate Sodium trioxovanadate(l-) Sodium vanadate Sodium vanadate (meta) Sodium vanadate(V) Sodium vanadate(V) (NaV03) Sodium vanadium oxide Vanadate (V03 ), sodium Vanadic acid (HVO3), sodium salt Vanadic acid, monosodium salt Used in manufacture of inks and in photography, mp = 630 insoluble in H2O LD75 (rat ip) = 4-5 mg V/kg. 

On 26 August 1867 Roscoe gave the true valency of vanadium and the correct formulae of its compounds. On 12 September he wrote Please ask Joseph [Heywood, the lecture assistant] to send me per book post Pogg. Atm.j vol. 98, in which is Rammelsberg s paper on the isomorphism of vanadates and phosphates. There is no doubt in my mind that vanadic acid is VtO(, and it will be exceedingly interesting to work out the vanadates which must all be ei lained as phosphates. The ordinary white NHs salt is NH4VO3 (like NaPO,) and is a meta-vanadate. The bi-vanadates can also be explained, but all need re-preparation and analysis. Did I tell you that we have now got VjOs, V 04, V 0 V 0 (I wish we had V also) VtO.Cl, V-O.Ch, VsO,Cl and V.O.CU, or VOCl VOCl VOCl. ... 

The yellow, amorphous variety is unstable and its identity is a little doubtful. It is stated to be obtained sometimes from the red, amorphous form by evaporation of a solution of the latter in hydrochloric acid, and it may also result from the ignition of ammonium meta-vanadate or from the decomposition of vanadates by acids. According to Bleecker it is most conveniently prepared by the electrolytic decomposition of copper vanadate.5 It becomes brick red on being heated, and is similar to the red variety in its general properties, except that it appears to be less hygroscopic and less soluble its saturated aqueous solution contains between 300 and 400 mgm. per litre.6... 

Vanadium pentoxide dissolves in acids, both organic and inorganic, to form vanadyl or unstable vanadic salts,7 and in alkalis to produce ortho-, pyro-, meta-, and poly-vanadates. The physico-chemical changes involved when vanadium pentoxide is heated with various basic oxides in the powder state have been investigated by Tammann.8 On being digested with liquid ammonia slow absorption of ammonia takes place the composition of the product has not been definitely established.9 The oxide also dissolves in alcohols to produce esters,10 and combines with methylamine and ethylamine to form compounds of the type 2(R.NHB).V205, where R represents the alkyl radical.11... 

Dissolve 0.6 g ammonium monovanadate (ammonium meta-vanadate) in 22.S ml water and careliilly add 2.5 ml cone, sulfuric acid and 25 ml acetone. 

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