Anhydro-iodic acid
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| Anhydro-iodic acid | |
|---|---|
| IUPAC name | iodic acid — diiodine pentaoxide (1/1) |
| Identifiers | |
| InChI | InChI=1/I2O5.HIO3/c3-1(4)7-2(5)6;2-1(3)4/h;(H,2,3,4) |
| Properties[1][2] | |
| Chemical formula | HI3O8 |
| Molar mass | 637.71 g mol−1 |
| Appearance | white solid |
| Density | 4.97 g cm−3 |
| Melting point |
200 °C decomp |
| Solubility in water | reacts |
| Structure[2] | |
| Space group | P21/n |
| Lattice constant | a = 754.8(10) pm, b = 768.0(10) pm, c = 1140.2(15) pm, α = 90°, β = 90.1(1)°, γ = 90° |
| Hazards[Note 1] | |
| EU index number | not listed |
| GHS pictograms |  
|
| GHS signal word | DANGER |
| GHS hazard statements | H272, H314, H318 |
| GHS precautionary statements | P210, P220, P221, P260, P264, P280, P301+330+331, P303+361+353, P363, P304+340, P310, P321, P305+351+338, P370+378 |
| Flash point | non-flammable |
| Related compounds | |
| Other compounds | Iodine pentoxide Iodic acid |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Anhydro-iodic acid, HI3O8, is an adduct of iodic acid and iodine pentoxide, i.e. HIO3·I2O5. It is formed by the partial dehydration of iodic acid at about 100 °C, or by absorption of water by iodine pentoxide.[1][Note 2] It can be dehydrated to I2O5 by heating in dry air to about 200 °C.[1]
Notes and references
Notes
- ↑ Hazards were assessed as for an equimolar mixture of iodic acid[3] and iodine pentoxide.[4]
- ↑ Commercial "I2O5" is said to be essentially anhydro-iodic acid.[1]
References
- ↑ 1.0 1.1 1.2 1.3 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 997–99, 1010. ISBN 0-08-022057-6.
- ↑ 2.0 2.1 Feikema, Y. D.; Vos, Aafje The crystal structures of two oxy-acids of iodine. II. An X-ray diffraction study of anhydro-iodic acid, HI3O8. Acta Crystallogr. 1966, 20 (6), 769–77. DOI: 10.1107/S0365110X6600183X.
- ↑ HSNO Chemical Classification Information Database, <http://www.ermanz.govt.nz/Chemicals/ChemicalDisplay.aspx?SubstanceID=12620> (accessed 9 September 2010), New Zealand Environmental Risk Management Authority. (iodic acid)
- ↑ HSNO Chemical Classification Information Database, <http://www.ermanz.govt.nz/Chemicals/ChemicalDisplay.aspx?SubstanceID=15707> (accessed 10 September 2010), New Zealand Environmental Risk Management Authority. (iodine pentoxide)
Further reading
- Ståhl, Kenny; Svensson, Christer; Szafranski, Marek A Combined Neutron Powder and X-Ray Single Crystal Diffraction Study of Anhydro-Iodic Acid, DIO3·I2O5, at 293 K. J. Solid State Chem. 1993, 102 (2), 408–13. DOI: 10.1006/jssc.1993.1052.
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