Sodium Molybdate (Sodium Molybdenum Oxide) (Na2MoO4.2H2O)-Powder

Characteristic

Sodium molybdate, Na₂MoO₄, is useful as a source of molybdenum. It is often found as the dihydrate, Na₂MoO₄·2H₂O.

Chemical formula：Na₂MoO₄

Molar mass：205.92 g/mol (anhydrous)   241.95 g/mol (dihydrate)

Appearance：White powder

Density 3.78 g/cm³, solid

Melting point：687 °C (1,269 °F; 960 K)

Solubility in water：84 g/100 ml (100 °C)

Refractive index (nD)：1.714

Application

The agriculture industry uses 1 million pounds per year as a fertilizer. In particular, its use has been suggested for treatment of whiptail in broccoli and cauliflower in molybdenum-deficient soils.

It is used in industry for corrosion inhibition, as it is a non-oxidizing anodic inhibitor. The addition of sodium molybdate significantly reduces the nitrite requirement of fluids inhibited with nitrite-amine, and improves the corrosion protection of carboxylate salt fluids.

In industrial water treatment applications where galvanic corrosion is a potential due to bimetallic construction, the application of sodium molybdate is preferred over sodium nitrite. Sodium molybdate has the advantage in that the dosing of lower ppm's of molybdate allow for lower conductivity of the circulating water.