3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||333.81 g/mol|
|Appearance||white crystalline solid |
|Melting point||300 °C (572 °F; 573 K) (decomposes)|
|Solubility||soluble in water and nitric acid; |
insoluble in ethanol, ether and CS2
Std enthalpy of
|Occupational safety and health (OHS/OSH):|
|NFPA 704 (fire diamond)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
(what is ?)
Iodine pentoxide is the chemical compound with the formula I2O5. This iodine oxide is the anhydride of iodic acid, and the only stable oxide of iodine. It is produced by dehydrating iodic acid at 200 °C in a stream of dry air:
I2O5 is bent with an I–O–I angle of 139.2°, but the molecule has no mirror plane so its symmetry is C2 rather than C2v. The terminal I–O distances are around 1.80 Å and the bridging I–O distances are around 1.95 Å.
Iodine pentoxide easily oxidises carbon monoxide to carbon dioxide at room temperature:
This reaction can be used to analyze the concentration of CO in a gaseous sample.
I2O5 forms iodyl salts, [IO2+], with SO3 and S2O6F2, but iodosyl salts, [IO+], with concentrated sulfuric acid.
Iodine pentoxide decomposes to iodine (vapor) and oxygen when heated to about 350 °C.