Zinc Tungstate, ZnWO₄

Zinc Tungstate, ZnWO₄, has been prepared by melting sodium tungstate with zinc chloride and common salt, and by heating sodium paratungstate with zinc.

The monohydrate, ZnWO₄.H₂O, falls as an amorphous precipitate when solutions of sodium tungstate and zinc acetate are mixed. One part dissolves in about 500 parts of water at 15° C. It remains white when dehydrated by heat.

The metatungstate, ZnO.4WO₃.10H₂O, the paratungstate, 5ZnO.12WO₃.37H₂O, the tungstate, ZnO.2WO₃.3H₂O, and the double tungstates, Na₂O.2ZnO.7WO₃.15 (and 21) H₂O and (NH₄)₂O.2ZnO.7WO₃.13H₂O, have been prepared.