Sodium molybdate CAS#7631-95-0

CAS Number: 7631-95-0
Chemical Formula: MoNa2O4
Synonyms:

Molybdic acid, disodium salt
Molybdic acid (H2MoO4), disodium salt
Molybdate (MoO42-), disodium, (T-4)-;molybdic

Appearance: White Powder

MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)

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Product Details

Sodium molybdate CAS#7631-95-0

Sodium molybdate is the sodium salt of molybdic acid. It forms white, rhombic crystals that are sparingly soluble in water and insoluble in acetone. Crystallization from an alkaline aqueous solution (pH above 8) yields the dihydrate, which appears as white rhombohedral crystals with a relative density of 3.28. In this structure, the molybdate anion (MoO₄²⁻) exhibits a regular tetrahedral coordination. Upon heating to 100°C, the dihydrate loses two water molecules to form the anhydrous compound. The anhydrous form is readily soluble in water but insoluble in ethyl acetate.

Gradually acidifying a sodium molybdate solution to lower its pH induces the polymerization of molybdate ions, forming various polymolybdates such as sodium dimolybdate, trimolybdate, tetramolybdate, octamolybdate, and decamolybdate.
Although molybdenum can form compounds in oxidation states from zero to +6, only the hexavalent molybdate compounds are stable. The primary ore for producing molybdate raw materials is molybdenite (MoS₂).

Sodium molybdate Chemical Properties

Melting point	687 °C (lit.)
density	3.78 g/mL at 25 °C (lit.)
refractive index	1.714
storage temp.	Store at 4°C, protect from light, stored under nitrogen
solubility	insoluble in EtOH; insoluble in DMSO; ≥20.6 mg/mL in H2O
form	Powder
Specific Gravity	3.28
color	White
Odor	odorless
Water Solubility	It is soluble in water.
Sensitive	Hygroscopic
Merck	14,8645
Exposure limits	ACGIH: TWA 0.5 mg/m3 NIOSH: IDLH 1000 mg/m3
Stability:	Stable. Incompatible with strong oxidizing agents.
Cosmetics Ingredients Functions	ANTICORROSIVE
InChIKey	TVXXNOYZHKPKGW-UHFFFAOYSA-N
CAS DataBase Reference	7631-95-0(CAS DataBase Reference)
NIST Chemistry Reference	sodium molybdate(VI)(7631-95-0)
EPA Substance Registry System	Disodium molybdate (7631-95-0)

Safety Information

Hazard Codes	Xi
Risk Statements	36/37/38
Safety Statements	26-36
WGK Germany	1
RTECS	QA5075000
TSCA	TSCA listed

Product Application of Sodium molybdate CAS#7631-95-0

Sodium molybdate (NazMoO4-2H2O), which is an important molybdenum source, is applied along with other fertilizers or as a foliar spray (with 39% molybdenum). Sodium molybdate is the sodium salt of molybdic acid. Fusing molybdenum oxide with sodium carbonate or hydroxide makes sodium molybdate.
Molybdenum is an essential component of the enzyme nitrate reductase which catalyzes the conversion of nitrate (NO3-) to nitrite (NO2-). It is also a component of the nitrogenase enzyme involved in nitrogen fixation by root nodule bacteria of leguminous crops. Soaking seeds in sodium molybdate solution (made with slurry or dust) before sowing is an effective seed treatment. Sodium molybdate, the most commonly used fertilizer supplying molybdenum, is used as foliar spray, or in mixed fertilizers. It is also used in seed treatment.

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