7782-99-2 Usage
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 have 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.
Used in Textile Industry:
Sulfurous acid is used as a bleaching agent for whitening wool, silk, feathers, sponge, straw, wood, and other natural products.
Used in Food Industry:
Sulfurous acid is used as a bleaching and preserving agent for dried fruits. It is also a food additive listed on the EAFUS food Additive Database (Jan. 2001).
Used in Environmental Applications:
Sulfurous acid 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.”
Used in Dental Applications:
Sulfurous acid is used as a dental bleach.
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.
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
Check Digit Verification of cas no
The CAS Registry Mumber 7782-99-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 2 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 7782-99:
(6*7)+(5*7)+(4*8)+(3*2)+(2*9)+(1*9)=142
142 % 10 = 2
So 7782-99-2 is a valid CAS Registry Number.
InChI:InChI=1/H2O3S/c1-4(2)3/h(H2,1,2,3)
