Selenic acid

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.

Selenic acid
Names
IUPAC name
Selenic(VI) acid
Other names
Selenic acid
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.029.072
EC Number
  • 231-979-4
KEGG
RTECS number
  • VS6575000
UNII
UN number 1905
  • InChI=1S/H2O4Se/c1-5(2,3)4/h(H2,1,2,3,4) Y
    Key: QYHFIVBSNOWOCQ-UHFFFAOYSA-N Y
  • InChI=1/H2O4Se/c1-5(2,3)4/h(H2,1,2,3,4)
    Key: QYHFIVBSNOWOCQ-UHFFFAOYAI
  • O[Se+2]([O-])([O-])O
Properties
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)
130 g/(100 mL) (30 °C)
Acidity (pKa) pKa1 = −3
pKa2 = 1.9
Conjugate base Biselenate
−51.2·10−6 cm3/mol
1.5174 (D-line, 20 °C)
Structure
tetrahedral at Se
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Corrosive, highly toxic
GHS labelling:
Danger
H301, H315, H318, H331, H373, H410
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
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references
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