Salts of Tungstic Acid-I

Tungstic acid resembles molybdic acid in that it reacts with bases to form many different types of salts. A satisfactory classification of these salts has long been, and still is, a matter of difficulty, owing to the fact that many of the compounds are only described by individual investigators, whose work is either insufficient in detail or has lacked confirmation by later workers. The existence of the di- and tri-tungstates prepared by Lefort has not been established. Laurent, in 1847, suggested that there were at least five distinct acids (combinations of tungstic anhydride with water in different proportions) with corresponding series of salts, and although the preparation and properties of all these acids have been described, it is now recognised, largely owing to the work of Riche, Scheibler, and Marignac, that only two different acids are definitely known to exist, namely, ordinary tungstic acid, H₂WO₄, and metatungstic acid, H₂W₄O₁₃.aq. The former is insoluble in water and reacts with bases to form normal di-, tri-, and para-tungstates; the latter is soluble in water and yields a well-defined series of salts, the metatungstates.


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