Atomistry » Tungsten » Compounds » Cobalt Tungstates
Atomistry »
  Tungsten »
    Compounds »
      Cobalt Tungstates »

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.

Last articles

Zn in 7VD8
Zn in 7V1R
Zn in 7V1Q
Zn in 7VPF
Zn in 7T85
Zn in 7T5F
Zn in 7NF9
Zn in 7M4M
Zn in 7M4O
Zn in 7M4N
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy