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