Selenic acid

Selenic acid
Names
	IUPAC name Selenic(VI) acid
	Other names Selenic acid
Identifiers
CAS Number	7783-08-6 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:18170 ;
ChemSpider	1058 ;
ECHA InfoCard	100.029.072
EC Number	231-979-4;
KEGG	C05697 ;
PubChem CID	1089;
RTECS number	VS6575000;
UNII	HV0Y51NC4J ;
UN number	1905
CompTox Dashboard (EPA)	DTXSID2064818 ;
	InChI InChI=1S/H2O4Se/c1-5(2,3)4/h(H2,1,2,3,4) Key: QYHFIVBSNOWOCQ-UHFFFAOYSA-N ; InChI=1/H2O4Se/c1-5(2,3)4/h(H2,1,2,3,4) Key: QYHFIVBSNOWOCQ-UHFFFAOYAI;
	SMILES O[Se+2]([O-])([O-])O;
Properties
Chemical formula	H2SeO4
Molar mass	144.9734 g/mol
Appearance	Colorless deliquescent crystals
Density	2.95 g/cm3, solid
Melting point	58 °C (136 °F; 331 K)
Boiling point	260 °C (500 °F; 533 K) (decomposes)
Solubility in water	130 g/(100 mL) (30 °C)
Acidity (pKa)	pKa1 = −3; pKa2 = 1.9
Conjugate base	Biselenate
Magnetic susceptibility (χ)	−51.2·10−6 cm3/mol
Refractive index (nD)	1.5174 (D-line, 20 °C)
Structure
Molecular shape	tetrahedral at Se
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Corrosive, highly toxic
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H315, H318, H331, H373, H410
Precautionary statements	P260, P261, P264, P270, P271, P273, P280, P301+P310, P302+P352, P304+P340, P305+P351+P338, P310, P311, P314, P321, P330, P332+P313, P362, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	3 0 2 OX
Related compounds
Other anions	selenious acid; hydrogen selenide
Other cations	sodium selenate; potassium selenate
Related compounds	Sulfuric acid; Selenium dioxide; Selenium trioxide; Telluric acid;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Selenic acid is the inorganic compound with the formula H₂SeO₄. It is an oxoacid of selenium, and its structure is more accurately described as O₂Se(OH)₂. It is a colorless compound. Although it has few uses, one of its salts, sodium selenate is used in the production of glass and animal feeds.