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Selenious acid

Selenious acid
Selenious acid structure
CAS No.
7783-00-8
Chemical Name:
Selenious acid
Synonyms
VANDEX;selaniuM;selenious;SELENIUM RED;SELENOUS ACID;Selenius Acid;Selenium acid;SELENIUM METAL;SELENIOUS ACID;SELENIUM, POWDER
CBNumber:
CB4854326
Molecular Formula:
H2O3Se
Formula Weight:
128.97408
MOL File:
7783-00-8.mol

Selenious acid Properties

Melting point:
70 °C (dec.)(lit.)
Boiling point:
684.9 °C(lit.)
Density 
4.81 g/mL at 25 °C(lit.)
Flash point:
690°C
storage temp. 
Store at RT.
solubility 
H2O: soluble
form 
powder
pka
2.46(at 25℃)
color 
White to almost white or light pink
Specific Gravity
3.004
Water Solubility 
167 g/100 mL (20 ºC)
Sensitive 
Hygroscopic
Merck 
14,8430
Stability:
Stable.
CAS DataBase Reference
7783-00-8(CAS DataBase Reference)
EPA Substance Registry System
Selenious acid(7783-00-8)
SAFETY
  • Risk and Safety Statements
Symbol(GHS) 
GHS06,GHS08,GHS09
Signal word  Danger
Hazard statements  H301-H331-H400-H301+H331-H373-H410
Precautionary statements  P260-P301+P310a-P304+P340-P311a-P405-P501a-P261-P273-P301+P310-P311-P501
Hazard Codes  T,N,Xi
Risk Statements  36/38-50/53-33-23/25-52/53
Safety Statements  61-60-45-28A-20/21-26-28
RIDADR  UN 3440 6.1/PG 3
WGK Germany  3
RTECS  VS7700000
3
TSCA  Yes
HazardClass  8
PackingGroup  III
HS Code  28111980

Selenious acid price More Price(13)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 211176 Selenous acid 98% 7783-00-8 10g $30.4 2018-11-20 Buy
Sigma-Aldrich 211176 Selenous acid 98% 7783-00-8 50g $60.9 2018-11-20 Buy
Alfa Aesar 010855 Selenous acid, Puratronic?, 99.999% (metals basis) 7783-00-8 25g $300 2018-11-16 Buy
Alfa Aesar 010855 Selenous acid, Puratronic?, 99.999% (metals basis) 7783-00-8 100g $934 2018-11-16 Buy
Strem Chemicals 34-0100 Selenous acid (99.999%-Se) PURATREM 7783-00-8 100g $512 2018-11-13 Buy

Selenious acid Chemical Properties,Uses,Production

Description

Selenious acid is a colourless, deliquescent crystal in appearance. It decomposes on heating, producing water and toxic fumes of selenium oxides.
It is incompatible with strong reducing agents, organic materials, and finely powdered metals and reacts on contact with acids producing toxic gaseous hydrogen selenide. Selenious acid is a non-combustible chemical. On fire/burning, it emits irritating or toxic fumes (or gases).
The major use of selenious acid is in changing the colour of steel, especially the steel in guns from silver grey to blue grey. It is also used for the chemical darkening and patination of copper brass and bronze, producing a rich dark-brown colour that can be further enhanced with mechanical abrasion.

Chemical Properties

White solid

Chemical Properties

Selenious acid is a colorless, crystalline solid.

Uses

As a reagent for alkaloids; as oxidizing agent.

General Description

Colorless solid, transparent, colorless crystals. Used as a reagent for alkaloids and as an oxidizing agent. Isotope is used in labeling radiopharmaceuticals.

Reactivity Profile

Selenious acid decomposes when heated to toxic and volatile selenium dioxide. Serves as an oxidizing agent. Reacts exothermically with many reducing agents including hydroiodic acid, sulfurous acid, sodium hyposulfite, hydroxylamine salts, hydrazine salts, hypophosphorous acid, phosphorous acid [Merck]. Oxidizes many organic substances. Is oxidized to selenic acid by strong oxidizing agents.

Hazard

Toxic by inhalation, ingestion, and skin absorption.

Health Hazard

Selenious acid and its salts are capable of penetrating the skin and can produce acute poisonings. Causes irritations and burns of the skin. It is highly toxic orally. Inorganic selenium compounds may cause dermatitis.

Fire Hazard

When heated to decomposition Selenious acid emits toxic fumes of selenium. Avoid heating.

Safety Profile

Poison by ingestion, intraperitoneal, and intravenous routes. Human mutation data reported. Used as an oxidizing agent. When heated to decomposition it emits toxic fumes of Se. See also SELENIUM COMPOUNDS

Potential Exposure

Selenious acid is used as a reagent for alkaloids and as an oxidizing agent. Isotope is used in labeling radiopharmaceuticals.

Shipping

UN3283Selenium compound, solid, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous material, Technical Name Required. UN3440 Selenium compound, liquid, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous material, Technical Name Required.

Purification Methods

Recrystallise the acid from water. On heating it loses water and SeO2 sublimes. [Waitkins & Clark Chem Rev 36 235 1945.]

Incompatibilities

A strong oxidizer. Reacts exothermically with many reducing agents including hydroiodic acid, sulfurous acid, sodium hyposulfite, hydroxylamine salts, hydrazine salts, hypophosphorous acid, phosphorous acid. Incompatible combustibles, organic material, oxidizable materials, strong acids, strong bases. Contact with acids produce toxic and gaseous hydrogen selenide. Attacks metals.

Waste Disposal

Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform to EPA regulations governing storage, transportation, treatment, and waste disposal.

Selenious acid Preparation Products And Raw materials

Raw materials

Preparation Products

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