Selenic acid

Description

Selenic acid · CAS 7783-08-6 · H2O4Se. UNII HV0Y51NC4J. Boiling Point: 260 °C (decomposes); Melting Point: 70; Melting Point: 58 °C.

Identification

CAS Registry Number	7783-08-6
PubChem CID	1089
Molecular formula	H2O4Se
IUPAC name	selenic acid
UNII (FDA)	HV0Y51NC4J

Computed Descriptors

Molecular Weight	144.98
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	0
Exact Mass	145.91183
Monoisotopic Mass	145.91183
Topological Polar Surface Area	74.6
Heavy Atom Count	5
Formal Charge	0
Complexity	81.3

Physical & Chemical Properties

Boiling Point	260 °C (decomposes)
Melting Point	70
Melting Point	58 °C
Solubility	1300 g in 100 mL water at 30 °C
LogP	-1.6279
Dissociation Constants	pKa1 = 1.7

Physical description & handling notes

• Selenic acid appears as a white crystalline solid. Very corrosive to skin, eyes and mucous membranes. Corrosive to metal. Toxic by skin absorption and by ingestion.
• Highly deliquescent solid; [Merck Index] White solid; [HSDB] Slightly yellow-green liquid; [MSDSonline] mp = 59.9 deg C; [Ullmann]
• White solid
• Hexagonal colorless prisms
• Decomposes
• Soluble

GHS Hazard Classification

Reported hazard statements	H301, H331 (86.7%), H315 (86.7%), H318 (88.9%), H373 (97.8%), H400 (97.8%), H410 (97.8%), H370

Documented Uses

• Used to make selenates by reaction with metal oxides or hydroxides; [Ullmann]
• Added to chromium-plating baths to improve corrosion protection from pitting, blistering, and rusting, especially of plated automobile articles exposed to salt in the North American snow belt.
• Prepared by treating lead selenate with hydrogen sulfide and concentrating the filtered soln by evaporation; ... by treating calcium selenate with cadmium oxalate and hydrogen sulfide; ... by treating a soln of silver selenite with bromine and evaporating the filtered solutionn; ... by oxidizing selenium oxide with 30% hydrogen peroxide and removing water.
• Selenous acid is oxidized to selenic acid by strong oxidizing agents such as chlorine, chloric acid, ozone, or anodic oxidation.
• Indicated for use as a nutritional supplement.
• Naturally occurring or synthetic substances that inhibit or retard oxidation reactions. They counteract the damaging effects of oxidation in animal tissues.

Synonyms

SELENIC ACID; 7783-08-6; HV0Y51NC4J; UN1905; Acid, Selenic; Selenate, Calcium; Selenate, Ammonium; Selenate, Magnesium; Selenate, Potassium; Selenate, Monosodium; CHEBI:18170; H2SeO4; selenic acid, calcium salt; selenic acid, ammonium salt; selenic acid, magnesium salt; selenic acid, potassium salt

Frequently Asked Questions

What are the CAS number and molecular formula of Selenic acid?

CAS 7783-08-6; molecular formula H2O4Se; molecular weight — g/mol.

What other names is Selenic acid known by?

SELENIC ACID, 7783-08-6, HV0Y51NC4J, UN1905, Acid, Selenic, Selenate, Calcium.

Is Selenic acid classified as hazardous?

Hazard statements reported: H301, H331, H315, H318, H373.

What are the key physical properties of Selenic acid?

Boiling Point: 260 °C (decomposes); Melting Point: 70; Melting Point: 58 °C; Solubility: 1300 g in 100 mL water at 30 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.