229857

Selenous acid

99.999% trace metals basis

• Synonym(s): Selenious acid
• Linear Formula: H₂SeO₃
• CAS Number: 7783-00-8
• Molecular Weight: 128.97
• EC Number: 231-974-7
• MDL number: MFCD00011331
• UNSPSC Code: 12352300
• PubChem Substance ID: 24853753
• NACRES: NA.23

Properties

• Quality Level: 200
• assay: 99.999% trace metals basis
• form: solid
• mp: 70 °C (dec.) (lit.)
• density: 3.004 g/mL at 25 °C (lit.)
• SMILES string: O[Se](O)=O
• InChI: 1S/H2O3Se/c1-4(2)3/h(H2,1,2,3)
• InChI key: MCAHWIHFGHIESP-UHFFFAOYSA-N

Description

General description

Selenous acid is a dibasic acid. It is the oxoacid of selenium and can be formed by adding selenium dioxide gas to water. Selenous acid shows analogy to sulfurous acid. As a crystalline solid, the molecules are arranged in a pyramid and in a solution it behaves as a diprotic acid.

Application

• Selenic acid etching assisted vacancy engineering for designing highly active electrocatalysts toward the oxygen evolution reaction: Examination of the use of selenous acid in vacancy engineering for electrocatalysts (Zhang et al., 2021).
• Europium (III) Catalysis for Reduction of Thionine Dye by Selenous Acid in Aqueous Sulfuric Acid Solutions: Study on the kinetics and mechanism of selenium(IV) reduction in aqueous sulfuric acid solutions (Fawzy, 2016).

Packaging

Packaged in High-Density Polyethylene (HDPE)

Safety Information

• pictograms: GHS06,GHS08,GHS09
• signalword: Danger
• hcodes: H301 + H331,H373,H410
• pcodes: P260 - P264 - P273 - P301 + P310 - P304 + P340 + P311 - P314
• Hazard Classifications: Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - STOT RE 2
• Storage Class: 6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
• wgk_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable
• ppe: Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges