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Sulfurous Acid

Sulfurous Acid
Sulfurous Acid structure
CAS No.
7782-99-2
Chemical Name:
Sulfurous Acid
Synonyms
Hso3;Hso3-;So3-2;yaliusuan;sulfurous;SULFUROUS ACID;SULPHUROUS ACID;schwefligesaure;SULPHUR DIOXIDE;Schweflige Sure
CBNumber:
CB6160852
Molecular Formula:
H2O3S
Formula Weight:
82.08
MOL File:
7782-99-2.mol

Sulfurous Acid Properties

Density 
1.03 g/mL at 25 °C(lit.)
vapor density 
2.3 (vs air)
pka
1.92(at 25℃)
form 
Liquid
color 
Colorless
Water Solubility 
Miscible with water.
Sensitive 
Air Sensitive
Merck 
14,8976
Stability:
Stable. Incompatible with strong bases.
InChIKey
LSNNMFCWUKXFEE-UHFFFAOYSA-N
CAS DataBase Reference
7782-99-2(CAS DataBase Reference)
Substances Added to Food (formerly EAFUS)
SULFUROUS ACID
EWG's Food Scores
1
FDA UNII
J1P7893F4J
EPA Substance Registry System
Sulfurous acid (7782-99-2)
SAFETY
  • Risk and Safety Statements
Symbol(GHS) 
GHS05,GHS07
Signal word  Danger
Hazard statements  H318-H314-H332
Precautionary statements  P280-P305+P351+P338-P310-P260h-P301+P330+P331-P303+P361+P353-P405-P501a
Hazard Codes  C,Xn
Risk Statements  20-34-36/38
Safety Statements  26-36/37/39-45
RIDADR  UN 1833 8/PG 2
WGK Germany  1
RTECS  WT2775000
10-23
TSCA  Yes
HazardClass  8
PackingGroup  II
HS Code  28111990
NFPA 704
1
3 1

Sulfurous Acid price More Price(5)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 247626 Sulfur dioxide solution ACS reagent, ≥6% 7782-99-2 100g $66.1 2020-08-18 Buy
Sigma-Aldrich 247626 Sulfur dioxide solution ACS reagent, ≥6% 7782-99-2 2kg $215 2020-08-18 Buy
Alfa Aesar 033275 Sulfurous acid, ACS 6.0% SO2 min 7782-99-2 *4x500ml $267 2021-03-22 Buy
Alfa Aesar 033275 Sulfurous acid, ACS 6.0% SO2 min 7782-99-2 500ml $71.4 2021-03-22 Buy
Sigma-Aldrich 247626 Sulfur dioxide solution ACS reagent, ≥6% 7782-99-2 500g $118 2020-08-18 Buy

Sulfurous Acid Chemical Properties,Uses,Production

Description

Sulfurous Acid is a weak and unstable inorganic acid, which is considered an aqueous solution of sulfur dioxide in water. It is formed theoretically by burning sulfur to produce sulfur dioxide, which is then reacted with water. However, there is no evidence that sulfurous acid exists in solution, while the molecules of which has been detected in the gas phase, since the reaction is reversible and the acid readily decomposes back into the reactants. Sulfurous acid is not usually available in its acid form, but more commonly prepared as its sodium or potassium salts.
Sulfurous acid and its salts are commonly applied as powerful reducing agents and disinfectant agents due to its strong reducibility. It is also considered as a mild bleaching agent especially for applications having chlorine sensitive materials. Besides, Sulfurous acid is a food additive listed on the EAFUS food Additive Database (Jan. 2001).

Chemical Properties

colourless liquid

Chemical Properties

SULFUROUS ACID, colorless liquid, prepared by dissolving SO2 in H2O. Reagent grade H2SO3 contains approximately 6% SO2 in solution

Uses

As a bleaching agent, sulfurous acid is used for whitening wool, silk, feathers, sponge, straw, wood, and other natural products. In some areas, its use is permitted for bleaching and preserving dried fruits. The salts of sulfurous acid are sulfites.

Uses

Sulfurous acid (H2SO3) can be produced by burning sulfur to form sulfur dioxide (SO2) gas and by then dissolving the gas in water to form sulfurous acid. This is the acid produced by burning coal that has a high sulfur content; the gaseous sulfur dioxide by-product of combustion then combines with atmospheric water to form “acid rain.”

Uses

Dental bleach.

Definition

A weak acid found only in solution, made by passing sulfur(IV) oxide into water. The solution is unstable and smells of sulfur(IV) oxide. It is a reducing agent, converting iron(III) ions to iron(II) ions, chlorine to chloride ions, and orange dichromate(VI) ions to green chromium(III) ions.

General Description

Sulfurous acid, H2S03, is an unstable, water-soluble, colorless liquid with a pungent burning sulfur odor. Corrosive to metals and tissue. It is derived from absorption of sulfur dioxide( S02) in water.Reagent grade sulfurous acid contains about 6% sulfur dioxide in solution. Sulfurous acid is a strong reducing agent.It is readily oxidized to sulfuric acid and is itself reduced to hydrogen sulfide by zinc and dilute sulfuric acid. Sulfurous acid is used in the synthesis of medicines and chemicals, in the manufacture of paper and wine, in brewing, in metallurgy, in ore flotation, as a bleach and analytical reagent, and for refining of petroleum products.

Air & Water Reactions

Soluble in water with release of heat.

Reactivity Profile

Colorless, corrosive, moderately toxic liquid. When heated to decomposition SULFUROUS ACID emits toxic fumes of oxides of sulfur [Lewis, 3rd ed., 1993, p. 1196].

Hazard

Toxic by ingestion and inhalation, strong irritant to tissue.

Health Hazard

TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Fire Hazard

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.

Industrial uses

Sulfurous acid (H2SO3) is usually marketed as liquid SO2. The bulk of SO2 is produced from off-smelter gases. Although handling of SO2 liquid requires special equipment, it is frequently used as a pH regulator and depressant, primarily during the treatment of complex sulfide ores. SO2 is largely used in North American operations as a pyrite depressant and for the depression of galena during copper/lead separation.

Safety Profile

A poison by ingestion and inhalation. A corrosive irritant to skin, eyes, and mucous membranes. Human systemic effects by ingestion: nausea or vomiting, hypermotility, diarrhea, and othergastrointestinal effects. When heated to decomposition it emits highly toxic fumes ofSOx.

References

https://en.wikipedia.org/wiki/Sulfurous_acid
http://printwiki.org/Sulfurous_Acid
http://www.softschools.com/formulas/chemistry/sulfurous_acid_uses_properties_structure_formula/242/
https://pubchem.ncbi.nlm.nih.gov/compound/Sulfurous_acid#section=Top
http://www.chemistrylearner.com/sulfurous-acid.html

Sulfurous Acid Preparation Products And Raw materials

Raw materials

Preparation Products


Sulfurous Acid Suppliers

Global( 145)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Hubei Jusheng Technology Co.,Ltd.
86-18871470254
027-59599243 linda@hubeijusheng.com CHINA 28229 58
Hubei xin bonus chemical co. LTD
86-13657291602
027-59338440 linda@hubeijusheng.com CHINA 23035 58
HENAN BON INDUSTRIAL CO.,LTD
0371-55170695
info@hnbon.com CHINA 26742 58
Qingdao kaimoshi biochemical technology co., ltd.
+(86) 571 87700752
+(86) 571 87700752 info@kaimosi.com CHINA 145 58
Shaanxi Dideu Medichem Co. Ltd
18192503167 +86-29-89586680
+86-29-88380327 1005@dideu.com CHINA 9938 58
Henan Alfa Chemical Co., Ltd
+8619139973225
adam@alfa-chemical.com;sales4@alfachem.cn China 11868 58
XINGTAI XINGJIU NEW MATERIAL TECHNOLOGY CO., LTD
+8617731987558
xingjiu@xingjiubiotech.com China 999 58
Mainchem Co., Ltd. +86-0592-6210733
+86-0592-6210733 sale@mainchem.com CHINA 32439 55
Shanghai Aladdin Bio-Chem Technology Co.,LTD 400-620-6333 021-20337333-801
021-50323701 market@aladdin-e.com China 24980 65
Alfa Aesar 400-610-6006
021-67582001/03/05 saleschina@alfa-asia.com China 30159 84

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