SODIUM MOLYBDATE [Na2MoO4]

 CAS Number 7631-95-0

·         Linear Formula Na₂MoO₄

·         Molecular Weight 205.92

·          EC Number 231-551-7

·          MDL number MFCD00003486

·          PubChem Substance ID 329752462

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

The molybdate(VI) anion is tetrahedral. Two sodium cations coordinate with every one anion.

Detailed Description:

Uses

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.^[5][6] However, care must be taken because at a level of 0.3 ppm sodium molybdate can cause copper deficiencies in animals, particularly cattle.^[3]

It is used in industry for corrosion inhibition, as it is a non-oxidizing anodic inhibitor.^[3] 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.^[7]

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. Sodium molybdate at levels of 50-100 ppm offer the same levels of corrosion inhibition that sodium nitrite at levels of 800+ ppm. By utilizing lower concentrations of sodium molybdate, conductivity is kept at a minimum and thus galvanic corrosion potentials are decreased.^[8]

Reactions

When reacted with sodium borohydride, molybdenum is reduced to a lower valent oxide:^[9]

Na₂MoO₄ + NaBH₄ + 2H₂O→ NaBO₂ + MoO₂ + 2NaOH+ 3 H₂

Sodium molybdate reacts with the acids of dithiophosphates:^[3]

Na₂MoO₄ + (RO)₂PS₂H (R = Me, Et) → [MoO₂(S₂P(OR)₂)₂]

which further reacts to form [MoO₃(S₂P(OR)₂)₄].

Safety

Sodium molybdate is incompatible with alkali metals, most common metals and oxidizing agents. It will explode on contact with molten magnesium. It will violently react with interhalogens (e.g., bromine pentafluoride; chlorine trifluoride). Its reaction with hot sodium, potassium or lithium is incandescent.

PRICES

$12420.48/KG OR $5645.67/IB

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