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Tungstic acid anhydride

CAS 1314-35-8 EINECS/ELINCS 215-231-4 Synonyms Cl 77901 Tungsten blue Tungsten oxide Tungsten trioxide Tungstic acid anhydride... [Pg.4616]

Molybdic and Tungstic Anhydrides. Place several ammonium molybdate crystals onto the lid of a crucible and first heat them carefully, and then roast them strongly. What occurs Perform a similar experiment with ammonium tungstate or tungstic acid. Write the equations of the reactions. At what temperature do molybdic and tungstic anhydrides sublime ... [Pg.219]

Of special interest are olefm epoxidation with peroxy acids at the moment of their formation from acid anhydrides and hydrogen peroxide. Among the catalysts of olefin oxide formation from olefins interacting with H202 in the presence of metal (Ti, W, V, Ta, Ge, Mo, U, Ru) oxides or acids are tungstic acid and its salts [47], Epoxidation is described by the following mechanism ... [Pg.192]

Thiazole A-oxides may result from the direct oxidation of thiazoles with hydrogen peroxide or with tungstic acid or peracetic acid. These products are unstable and break down by autoxidation 2,4-dimethylthiazole 3-oxide rearranges in acetic anhydride into... [Pg.254]

Tungstic acid sodium salt Tungstic acid sodium salt dihydrate. See Sodium tungstate Tungstic anhydride Tungstic oxide. See Tungsten oxide (ic)... [Pg.4617]

The other method was wet chemical . The finely powdered mineral was treated with nitric acid. It was attacked and some of it was dissolved. The solution contained calcium nitrate. The insoluble residue was partly not attacked tungsten mineral and partly a yellow precipitate, formed in the reaction. Scheele thought that this was the anhydride of the tungstic acid. The yellow precipitate could be dissolved in ammonia. From this solution tungstic acid was precipitated with diluted nitric acid... [Pg.610]

The separation of the tungstic oxide and silica in the anhydride is effected by the method of Perillon8 wherein the tungstic oxide is volatilized in a current of gaseous hydrogen chloride. The silica is then volatilized by means of hydrofluoric and sulfuric acids. Since W03 cannot be collected readily, its weight is determined by difference. [Pg.131]

Tungsten Subphosphide, W4P3.—By strongly heating a mixture of phosphoric acid and tungstic anhydride in a carbon crucible, lustrous steel-coloured crystals of this phosphide are obtained. The crystals are si.x-sided prisms of density 5-21. It conducts electricity well, is very" stable in air even at higher temperatures, and is very resistant to acids. When heated in a current of oxygen it bums brilliantly. It dissolves in a fused mixture of alkali carbonate and nitrate. [Pg.250]

See other pages where Tungstic acid anhydride is mentioned: [Pg.390]    [Pg.390]    [Pg.953]    [Pg.1295]    [Pg.1295]    [Pg.659]    [Pg.4617]    [Pg.390]    [Pg.390]    [Pg.390]    [Pg.953]    [Pg.1295]    [Pg.1295]    [Pg.659]    [Pg.4617]    [Pg.390]    [Pg.518]    [Pg.990]    [Pg.154]    [Pg.131]    [Pg.990]    [Pg.183]    [Pg.201]    [Pg.208]    [Pg.209]    [Pg.221]    [Pg.222]    [Pg.223]    [Pg.249]    [Pg.269]    [Pg.270]    [Pg.1293]    [Pg.147]    [Pg.273]    [Pg.390]    [Pg.954]    [Pg.31]    [Pg.77]    [Pg.230]    [Pg.324]    [Pg.1928]    [Pg.183]    [Pg.184]    [Pg.221]    [Pg.256]    [Pg.257]    [Pg.259]   
See also in sourсe #XX -- [ Pg.8 , Pg.953 ]



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Tungstic acid

Tungstic anhydride

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