DIIODINE PENTOXIDE* - (12029-98-0)

Introduction

Name: diiodine pentoxide*; iodine(V) oxide; iodic anhydride
* IUPAC
CAS Number: 12029-98-0
Chemical Formula: I2O5
Molar Mass: 333.80594 g
State of Matter: white hygroscopic crystalline solid
Mass Percent: I 76.034 %; O 23.965 % 

Classification

• inorganic

Uses/Function

• "Oxidizes carbon monoxide with the form[atio]n of iodine (Ditte's reaction, which proceeds rapidly at 65° or above, but slowly at room temp). This reaction is used in gas analysis and for removing carbon monoxide from the air (in respirators preferably in presence of some H2SO4)." 1

Physical Properties

Melting Point:*
300°C 2 = 573.15 K = 572°F

Density (g/cm3):
4.98 at room temperature/pressure 2
5.08 at 25°C 1
* - 1 atm pressure

Solubility

Qualitative:
insoluble:  • • 2

Bonding

Bonding: polar covalent
Ionic Character: 23.64 %

Thermochemistry

ΔHf° (s): -37.78 kcal/mol 3 = -158.07 kJ/mol

Safety Information

NFPA 704 Ratings:
Health: 3 - Short exposure could cause serious temporary or moderate residual injury.
Flammability: 0 - Will not burn.
Reactivity: 0 - Normally stable, even under fire exposure conditions, and is not reactive with water.
Special Hazard: OX - Oxidizer.

For More Information

Wikipedia
Journals:
Lamb et. al., J. Am. Chem. Soc. 42, 1644 (1920)
Selte, Kjekshus, Acta Chem. Scand. 24, 1912 (1970)

Sources

(1) - The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals, 13th ed.; Budavari, S.; O'Neil, M.J.; Smith, A.; Heckelman, P. E.; Kinneary, J. F., Eds.; Merck & Co.: Whitehouse Station, NJ, 2001; entry 5041.
(2) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4-61.
(3) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:28.
(4) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:28.
(5) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:28.