Sodium Molybdate: Source of Molybdenum - WorldOfChemicala

Chemistry of Sodium Molybdate

Sodium molybdate is an important source of molybdenum and mostly occurs as sodium molybdate dehydrate. Its chemical formula is Na2MoO4. The molybdate anion is tetrahedral.Two sodium cations coordinate for each anion.



Sodium molybdate was first produced by hydration process. It can be produced by dissolving molybdenum trioxide in sodium hydroxide within a temperature range of 50-70°C and then crystallizing the filtered product. The final anhydrous product is obtained by heating it to 100°C.


MoO3 + 2NaOH + H2O → Na2MoO4·2H2O


The above reaction illustrates the production reaction, where molybdenum trioxide reacts with sodium hydroxide to produce sodium molybdate along with water.



Water Treatment

Sodium molybdate is preferred over sodium nitrite in the industrial water treatment process, where there is a potential of galvanic corrosion owing to its bimetallic construction. It facilitates lower conductivity in the coursing water when the dosage is in lower ppm's of molybdate.

Sodium molybdate can offer consumption restraint, within the range of 50-100 ppm. Whereas, sodium nitrate would have to be at levels of 800 ppm to offer the same consumption restraint. The lower concentrations of sodium molybdate would maintain low conductivity and therefore the potentials of galvanic consumption are diminished.



The agriculture industry uses nearly half a million kilograms of sodium molybdate as fertilizer annually. It is important for the conversion of nitrates present in leaves to proteins and amino acids. Molybdenum is essential for the optimum growth of leguminous plants.


This chemical is used to treat whiptail disorder in plants such as broccoli and cauliflower, which occurs due to the deficiency of molybdenum in the soil. Its dosage must be within limits, which otherwise would lead to copper deficiencies in animals.


Chemicals Tracer

Sodium molybdate finds applications in medicinal chemistry and biochemistry. It is used to track numerous natural organic chemicals, which are colorless post chromatographical analysis, where it stains blue. The blue color is known as molybdenum blue.

Corrosion Inhibition

Sodium molybdate is a non-oxidizing anodic inhibitor and therefore used in corrosion inhibition. This chemical reduces the requirement of nitrate by fluids inhibited with nitrite amine and subsequently enhances the corrosion security of carboxylate salt fluids.



Sodium molybdate is not compatible with oxidizing agents, alkali metals and many normal metals. This chemical could blast, when coming in contact with liquid magnesium. It violently reacts with interhalogens such as bromine pentafluoride and chlorine trifluoride. Sodium molybdate results in incandescent reactions when treated with hot lithium, sodium or potassium.


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