Molybdic acid

Molybdic acid
Identifiers
CAS number	7782-91-4
ChemSpider	74188
EC number	231-970-5
Jmol-3D images	Image 1
SMILES O=[Mo](=O)(O)O
InChI InChI=1/Mo.2H2O.2O/h;2*1H2;;/q+2;;;;/p-2/rH2MoO4/c2-1(3,4)5/h2-3H Key: VLAPMBHFAWRUQP-LHLUJLTBAG
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)
Infobox references

Molybdic acid refrs 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.^[3]. 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.^[4]

The salts of molybdic acid are called molybdates.

References

1. ^ ^{a b c d} http://www.chemicalbook.com/ChemicalProductProperty_EN_CB8854324.htm
2. ^ http://www.chemspider.com/RecordView.aspx?rid=e75000d7-a392-4602-8ca4-f2bd1f94b31c
3. ^ Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
4. ^ Solution structure of molybdic acid from Raman spectroscopy and DFT analysis, Oyerindea O.F., Week C.L., Anbarb A.D., Spiro T.G. Inorganica Chimica Acta, 361, 4, (2008), 1000-1007, doi:10.1016/j.ica.2007.06.025