Iodic acid

Iodic acid is a white water-soluble solid with the chemical formula HIO3. Its robustness contrasts with the instability of chloric acid and bromic acid. Iodic acid features iodine in the oxidation state +5 and is one of the most stable oxo-acids of the halogens. When heated, samples dehydrate to give iodine pentoxide. On further heating, the iodine pentoxide further decomposes, giving a mix of iodine, oxygen and lower oxides of iodine.

Iodic acid
Names
Other names
Iodic(V) acid
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.029.056
PubChem CID
UNII
  • InChI=1S/HIO3/c2-1(3)4/h(H,2,3,4) Y
    Key: ICIWUVCWSCSTAQ-UHFFFAOYSA-N Y
  • InChI=1/HIO3/c2-1(3)4/h(H,2,3,4)
    Key: ICIWUVCWSCSTAQ-UHFFFAOYAT
SMILES
  • O[I+2]([O-])[O-]
Properties
HIO3
Molar mass 175.91 g/mol
Appearance White solid
Density 4.62 g/cm3, solid
Melting point 110 °C (230 °F; 383 K)
269 g/100 mL (20 °C)
Acidity (pKa) 0.75
Conjugate base Iodate
Magnetic susceptibility (χ)
 −48.0·10−6 cm3/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 acid, corrosive, oxidant
GHS labelling:
Danger
NFPA 704 (fire diamond)
3
0
1
OX
Flash point Non-flammable
Related compounds
Other cations
 Lithium iodate
Potassium iodate
Related halogen oxoacids
 Chloric acid
Bromic acid
Related compounds
 Hydroiodic acid
Iodine pentoxide
Periodic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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