| IUPAC name
| Preferred IUPAC name
| Systematic IUPAC name
| Other names
|Molar mass||333.81 g/mol|
|Odor|| Odorless (pure)|
|Density||5.08 g/cm3 (20 °C)|
|Melting point||350 °C (662 °F; 623 K) (decomposes)|
|187 g/100 ml (hydrolysis)|
|Solubility|| Soluble in nitric acid|
Insoluble in acetonitrile, carbon disulfide, chloroform, diethyl ether, ethanol
|Vapor pressure||~0 mmHg|
|Safety data sheet||Sigma-Aldrich|
| Dichlorine heptoxide|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
- I2O5 + H2O → 2 HIO3
- 5 CO + I2O5 → I2 + 5 CO2
This reaction, called Ditte's reaction, can be used to analyze the concentration of CO in a gaseous sample.
- 3 I2O5 + 5 H2S → 3 I2 + 5 SO2 + 5 H2O
Elemental sulfur will also oxidize to sulfur dioxide, though strong heat is required to initiate the reaction.
- 2 I2O5 + 5 S → 5 I2 + 2 SO2
A mixture of carbon and iodine pentoxide will ignite with a drop of conc. sulfuric acid is added to it.
Mixing iodine pentoxide with lithium borohydride is sufficient to ignite said mixture.
- I2O5 + 12 HCl → 2 HICl4 + 2 Cl2 + 5 H2O
I2O5 forms iodyl salts, [IO2+], with sulfur trioxide and bis(fluorosulfuryl)peroxide, but iodosyl salts, [IO+], with concentrated sulfuric acid.
Iodine pentoxide is a white dense solid, that readily hydrolyzes in water. The pure compound is odorless, but exposure to impurities will release minute amounts of elemental iodine, giving the sample a faint iodine-like odor.
Iodine pentoxide can be bought from chemical suppliers.
Iodine pentoxide is produced by dehydrating iodic acid at 200 °C in a stream of dry air:
- 2 HIO3 → I2O5 + H2O
- 2 HIO4 → I2O5 + H2O + O2
- Detection of carbon monoxide
- Make Al-I2O5 thermite
Iodine pentoxide is a powerful oxidizer and may ignite combustible materials on contact.
In closed airtight bottles.
Should be reduced with sodium thiosulfate or some other reducing agent.
- IODINE Its Properties and Technical Applications, CHILEAN IODINE EDUCATIONAL BUREAU, INC., 120 Broadway, New York 5, New York, 1951