Molybdic acid

CAS number : 7782-91-4

Molecular weight :161.95

Molecular formula/chemical symbol :H2MoO4

Description :

Molybdic acid refers to solid, hydrated forms of molybdenum trioxide and species in aqueous solution.

The simplest solid form, the monohydrate, is MoO₃·H₂O, though the dihydrate (MoO₃·2H₂O) is also known. The solid state structure of MoO₃·H₂O consists of layers of octahedrally coordinated MoO₅·(H₂O) units where 4 vertices are shared. The dihydrate has the same layer structure with the extra H₂O molecule intercalated between the layers.

In aqueous solutions of acidified molybdate salts low concentration molecular O₃Mo·3H₂O has been characterised spectroscopically.

The salts of molybdic acid are called molybdates.

Molybdic acid
Identifiers
CAS number	7782-91-4
PubChem	82208
ChemSpider	74188
EC number	231-970-5
Jmol-3D images	Image 1
Properties
Molecular formula	MoO3·H2O
Molar mass	161.95 g mol-1 [1]
Density	3.1 g cm-3 [1]
Solubility in water	1510 mg dm-3 [2]
Hazards
R-phrases	R36/37/38 [1]
S-phrases	S24/25, S22 [1]
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

USES :

For the preparation of other molybdenum compounds and molybdenum metal.

Manufacture of molybdenum-based catalysts, blue ceramic glaze and paint.

Keywords:Fine ceramics;Petroleum chemicals