Sodium molybdate crystals and original package
| IUPAC name
| Other names
|Molar mass|| 205.92 g/mol (anhydrous)|
241.95 g/mol (dihydrate)
|Melting point||687 °C (1,269 °F; 960 K)|
|84 g/100 ml (100 °C)|
|Solubility||Insoluble in hydrocarbons|
|Vapor pressure||~0 mmHg|
|Safety data sheet||Sigma-Aldrich|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|4,000 mg/kg (rat, oral)|
LC50 (Median concentration)
|>2,080 mg/m3 (rat, 4 hr)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Sodium molybdate (Na2MoO4) is chemical compound, useful as a readily source of molybdenum. It is often encountered as the dihydrate form Na2MoO4·2H2O.
Sodium molybdate will react energetically with interhalogens (bromine pentafluoride, chlorine trifluoride, etc.).
- Na2MoO4 + NaBH4 + 2 H2O → NaBO2 + MoO2 + 2 NaOH + 3 H2
Sodium molybdate is a white crystalline solid, soluble in water, but insoluble in most organic solvents.
Sodium molybdate is sold as fertilizer for plants, and is available at many gardening stores, though it's a bit more expensive than most common fertilizers.
It can also be purchased from lab suppliers, online.
- MoO3 + 2 NaOH + H2O → Na2MoO4·2H2O
The anhydrous salt is prepared by heating the dihydrate to 100 °C.
- Source of molybdenum
Sodium molybdate has low toxicity. Inhalation may cause irritation of nose and lungs.
In closed bottles
No special disposal is required.
- Chi Fo Tsang and Arumugam Manthiram. Journal of Materials Chemistry 1997. 7(6). 1003–1006.