Periodic acid

Periodic acid

Orthoperiodic acid
Metaperiodic acid
Names
Other names Paraperiodic acid Iodic(VII) acid Hydrogen periodate
Identifiers
CAS Number	10450-60-9 (orthoperiodic) N 13444-71-8 (metaperiodic) N
3D model (Jmol)	(orthoperiodic): Interactive image (metaperiodic): Interactive image
ChemSpider	23622 (orthoperiodic) N 58684 (metaperiodic) N
ECHA InfoCard	100.030.839
PubChem CID	65185 (metaperiodic)
UNII	AK1D44L87G N
InChI (orthoperiodic): InChI=I=1S/H5IO6/c2-1(3,4,5,6)7/h(H5,2,3,4,5,6,7) Key: TWLXDPFBEPBAQB-UHFFFAOYSA-N (metaperiodic): InChI=1/HIO4/c2-1(3,4)5/h(H,2,3,4,5) Key: KHIWWQKSHDUIBK-UHFFFAOYAH
SMILES (orthoperiodic): OI(=O)(O)(O)(O)O (metaperiodic): OI(O)(O)(O)(O)=O
Properties
Chemical formula	H5IO6 (orthoperiodic) HIO4 (metaperiodic)
Molar mass	227.941 g/mol (H5IO6) 190.91 g/mol (HIO4)
Appearance	Colourless crystals
Melting point	128.5 °C (263.3 °F; 401.6 K)
Solubility	soluble in water, alcohols
Hazards
Safety data sheet	External MSDS
EU classification (DSD)	Oxidizer (O), Toxic (T), Corrosive (C)
R-phrases	R23 R24 R25 R34 R41
NFPA 704	0 3 0 OX
Related compounds
Other anions	Perchloric acid HClO4 Perbromic acid HBrO4 Permanganic acid HMnO4 Telluric acid Te(OH)6 perxenic acid Xe(OH)6
Other cations	Sodium periodate Potassium periodate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Periodic acid (pronounced per-iodic /ˌpɜːr.aɪˈɒdᵻk/ PURR-eye-OH-dik, rather than /ˌpɪəriˈɒdᵻk/ PEER-ee-OD-ik as in periodic table) is the highest oxoacid of iodine, in which the iodine exists in oxidation state VII. Like all periodates it can exist in two forms: orthoperiodic acid, with the chemical formula H₅IO₆ and metaperiodic acid, which has the formula HIO₄.

Periodic acid was discovered by Heinrich Gustav Magnus and C. F. Ammermüller in 1833.

Modern industrial scale production involves the electrochemical oxidation of iodic acid, on a PbO₂ anode, with the following standard electrode potential: