Difference of Sodium Tungstate and Sodium Tungstate Dihydrate

sodium tungstate picture.

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