Atomistry » Tungsten » Compounds » Iron Tungstates
Atomistry »
  Tungsten »
    Compounds »
      Iron Tungstates »

Iron Tungstates

Ferrous tungstate occurs in the minerals fer- berite and reinite and with manganese in wolframite. It may be prepared in the crystalline form by fusing together sodium tungstate, sodium chloride, and ferrous chloride; the crystals, which are lustrous, black, and opaque, have density 7.1. It is also formed when a mixture of tungstic anhydride and ferrous oxide is strongly heated in a current of hydrogen chloride. The trihydrate, FeWO4.3H2O, is precipitated as a light brown powder by the addition of a ferrous salt to sodium tungstate solution.

Ferrous ditungstate, FeO.2WO3.2H2O, results as a cinnamon-brown precipitate when a ferrous salt is added to a solution of sodium ditungstate.

Ferric Tungstate. - The cream-coloured precipitate formed on the addition of a ferric salt to a solution of ammonium tungstate is considered by Lotz to be ferric tungstate. The salts, 2Fe2O3.3WO3.6H2O, Fe2O3.2WO3.4H2O, and Fe2O3.4WO3.4H2O, are described by Lefort.

A complex ferritungstic acid and corresponding salts have been isolated, the acid being considered by Rosenheim to be a tetrabasic ferrihexatungstic acid of composition H9[Fe(WO4)6], the ammonium and potassium salts having the formula R4H5[Fe(WO4)6].9H2O. The latter are precipitated by adding the alkali chloride to a mixture of the alkali paratungstate and ferric chloride. A guanidinium salt, (CH6N3)3H6[Fe(WO4)6].5H2O, has also been prepared.

Last articles

Zn in 8WB0
Zn in 8WAX
Zn in 8WAU
Zn in 8WAZ
Zn in 8WAY
Zn in 8WAV
Zn in 8WAW
Zn in 8WAT
Zn in 8W7M
Zn in 8WD3
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy