Potassium Tungstate

Potassium tungstate is white or colorless crystalline powder and is a monoclinic structure. Its physical properties are as follows: chemical formula: K2O4W, molecular weight: 326.0342, density: 3.12g/ml, melting point: 921 ℃, Solubility: soluble in water, insoluble in alcohol. K2O4W should be sealed in the storage vessel, and it is placed in a cool, dry place. Besides avoids contact with tungsten oxide, moisture or humidity. In addition, it is harm for the water, if there is no relevant government departments permission shouldn’t released to the surrounding.
Potassium tungstate is mainly used in analytical reagents, alkaloids precipitant, but also for the fine tungsten and bronze manufacture.
Potassium tungstate producing processes are as follows:
1.Mixed potassium dichromate (K2Cr2O7) with tungsten powder, after reaction to obtain potassium tungstate and chromium oxide.
2.W react with KOH to produce potassium tungstate.
W reacts with KOH solution, if no oxygen participate there is a slight reaction. But the reaction has oxidizing agent (such as KNO3, KNO2, KClO3, PbO2, etc.) will cause violet reaction.

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