Sodium periodate

Sodium periodate

Names
IUPAC name Sodium periodate
Other names Sodium metaperiodate
Identifiers
CAS Number	7790-28-5 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:75226 N
ChemSpider	58683 Y
ECHA InfoCard	100.029.270
EC Number	232-197-6
PubChem CID	23667635
RTECS number	SD4550000
InChI InChI=1S/HIO4.Na/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1 Y Key: JQWHASGSAFIOCM-UHFFFAOYSA-M Y InChI=1/HIO4.Na/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1 Key: JQWHASGSAFIOCM-REWHXWOFAO InChI=1S/HIO4.Na/c2-1(3,4)5;/h(H,2,3,4,5);/q;+1/p-1 Key: JQWHASGSAFIOCM-UHFFFAOYSA-M
SMILES [O-]I(=O)(=O)=O.[Na+]
Properties
Chemical formula	NaIO4
Molar mass	213.8918 g/mol
Appearance	white crystals
Density	3.865 g/cm3 (anhydrous) 3/210 g/cm3
Melting point	300 °C (572 °F; 573 K) (anhydrous) 175 °C (347 °F; 448 K) (trihydrate) (decomposes)
Solubility in water	soluble
Solubility	soluble in acids
Structure
Crystal structure	tetragonal (anhydrous) trigonal (trihydrate)
Hazards
NFPA 704	0 2 0
Related compounds
Other anions	sodium perchlorate, sodium perbromate
Other cations	potassium periodate, periodic acid
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

Sodium periodate is an inorganic salt, composed of a sodium cation and the periodate anion. It may also be regarded as the sodium salt of periodic acid. Like many periodates it can exist in two different forms: sodium metaperiodate, which has the formula NaIO₄, and sodium orthoperiodate, normally this means sodium hydrogen periodate (Na₂H₃IO₆) but the fully reacted sodium orthoperiodate salt, Na₅IO₆, can also be prepared. Both salts are useful oxidising agents.

Classically, periodate was most commonly produced in the form of sodium hydrogen periodate (Na₃H₂IO₆). This is commercially available, but can also be produced by the oxidation of iodates with chlorine and sodium hydroxide. Or, similarly, from iodides by oxidation with bromine and sodium hydroxide:

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

Sodium metaperiodate can be prepared by the dehydration of sodium hydrogen periodate with nitric acid.

Sodium metaperiodate (NaIO₄) forms tetragonal crystals (space group I4₁/_a) consisting of slightly distorted IO−
4 ions with average I–O bond distances of 1.775 Å; the Na⁺ ions are surrounded by 8 oxygen atoms at distances of 2.54 and 2.60 Å.