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Cobalt Tungstates

The anhydrous normal salt, CoWO4, is obtained as greenish-black crystals by fusing together sodium tungstate, sodium chloride, and cobalt chloride. The hydrate, CoWO4.2H2O, results as a violet precipitate when a solution of alkali tungstate is treated with a solution of a cobalt salt.

Cobalt ditungstate, CoO.2WO3.3H2O, is obtained as a reddish-brown precipitate by double decomposition.

Cobalt paratungstate, 3CoO.7WO3.25H2O, is formed as a bright rose-coloured microcrystalline precipitate on mixing solutions of sodium paratungstate and a cobalt salt. It does not melt at a red heat, but on cooling it acquires a bluish tinge. The double salt, 3Na2O.2CoO.12WO3.30H2O, is prepared in the same way as the corresponding double salt of calcium. It forms rose-coloured crystals which melt at red heat and solidify, on cooling, to a black lustrous mass. Double salts, of composition 2Na2O.3CoO.12WO3.41H2O and Na2O.4CoO.12WO3.23H2O, have been prepared by Rosenheim, who suggests for them the formulae Na4Co3H10[H2(WO4)6]2.34H2O and NaCo2H5[H2(WO4)6].16H2O, respectively.

The salt, 4CoO.10WO3.35H2O, is obtained as a pink granular powder by the method used for the corresponding barium salt.

Cobalt tritungstate, CoO.3WO3.4H2O, is described by Lefort.

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