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Difference of Sodium Tungstate and Sodium Tungstate Dihydrate

Sodium tungstate dihydrate belongs to sodium tungstate, another form of sodium tungstate, the difference in theory is that one with non-water, and the other with two water molecules. However, sodium tungstate dihydrate is also commonly referred to sodium tungstate, while Na₂WO₄refers to anhydrous sodium tungstate.

sodium tungstate: Sodium tungstate is Na₂WO₄；sodium tungstate dihydrate is Na₂WO₄·2H₂O
CAS Number：sodium tungstate is 13472-45-2；sodium tungstate dihydrate is 10213-10-2；
Density: Sodium tungstate is 44.179g/cm³；sodium tungstate dihydrate is 3.23g/cm³；

Difference of Preparation

Anhydrous sodium molybdate can be obtained by fusion reaction of tungsten trioxide (WO₃) and sodium hydroxide (NaOH) or sodium carbonate (Na₂CO₃), the formula equation is:
WO₃+2NaOH→Na₂WO₄+H₂O
WO₃+Na₂CO₃→Na₂WO₄+CO₂

However, if prepared by solution crystallization process, it always gets the product of sodium tungstate dihydrate Na₂WO₄·2H₂O。

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1.Tungsten Trioxide

2.Tungsten Oxide