Sodium molybdate for agriculture is first synthesized by hydration method. A more convenient synthesis is performed by dissolving MoO3 in sodium hydroxide at 50–70 °C and crystallizing the filtered product. Anhydrous salts were prepared by heating to 100°C.
MoO 3 + 2NaOH + H 2 O→Na 2 MoO 4 2H 2 O.
Agricultural sodium molybdate uses 1 million pounds per year as fertilizer. In particular, its use has been suggested for the treatment of whiptail in cauliflower and cauliflower in molybdenum-deficient soils. Care must be taken though, as sodium molybdate levels of 0.3 ppm can cause copper deficiency in animals, especially cattle.
It is used industrially for corrosion inhibition because it is a non-oxidizing anodic inhibitor. The addition of sodium molybdate significantly reduces the nitrite demand of nitrite amine inhibited fluids and improves the corrosion protection of carboxylate fluids.
Sodium molybdate is preferred over sodium nitrite in industrial water treatment applications where galvanic corrosion occurs due to the bimetallic structure. The advantage of sodium molybdate is that the addition of lower ppm molybdate can reduce the conductivity of the circulating water. The content of sodium molybdate at 50-100ppm is the same as sodium nitrite above 800ppm, which has the same level of corrosion inhibition. By using lower concentrations of sodium molybdate, the electrical conductivity is kept to a minimum and thus the galvanic corrosion potential is reduced.
When sodium molybdate reacts with sodium borohydride, molybdenum is reduced to lower-valent oxides:
Na 2 MoO 4 + NaBH 4 + 2H 2 O → NaBO 2 + MoO 2 + 2NaOH + 3 H 2
The acid reaction of sodium molybdate with dithiophosphoric acid:
Na2MoO4 + (RO)2PS2H (R = Me, Et) → [MoO2(S2P(OR)2)2]
Further reaction forms [MoO 3 (S 2 P(OR) 2 ) 4 ].
Sodium molybdate is incompatible with alkali metals, most common metals and oxidizing agents. It explodes on contact with molten magnesium. It reacts violently with halogens (eg, bromine pentafluoride; chlorine trifluoride). Its reaction with hot sodium, potassium or lithium is incandescent.
Related tags: Sodium molybdate, Sodium tungstate,
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