Molybdic acid

Molybdic acid

Names
Other names Molybdic(VI) acid
Identifiers
CAS Number	7782-91-4
ChemSpider	74188
EC Number	231-970-5
Jmol 3D model	Interactive image
PubChem	82208
InChI InChI=1/Mo.2H2O.2O/h;2*1H2;;/q+2;;;;/p-2/rH2MoO4/c2-1(3,4)5/h2-3H Key: VLAPMBHFAWRUQP-LHLUJLTBAG
SMILES O=[Mo](=O)(O)O
Properties
Chemical formula	MoO3·H2O
Molar mass	161.95 g mol−1
Density	3.1 g cm−3
Melting point	300 °C (572 °F; 573 K)
Solubility in water	1510 mg dm−3
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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 and its salts are used to make the Froehde reagent for the presumptive identification of alkaloids.