Basic information
- CAS
14265-45-3- Standard SMILES
O=S(O)O- InChIKey
LSNNMFCWUKXFEE-UHFFFAOYSA-N- Molecular formula
- H2O3S
- Average molar mass
- 82.08 g/mol
- Monoisotopic mass
- 81.97246492
Overview
Sulfurous acid appears as a colorless liquid with a pungent burning sulfur odor. Corrosive to metals and tissue.
Names & identifiers
- Preferred name
- Sulfurous Acid
- IUPAC
- sulfurous acid
Names & synonyms
Sulfurous acid7782-99-2Sulphurous acidSchweflige saureH2SO3EINECS 231-973-1acide sulfureuxacido sulfurososchweflige Saeuretrioxosulfuric aciddihydroxidooxidosulfurUNII-J1P7893F4J
Show more names
CHEBI:48854SULFUROUS ACID (H2SO3)J1P7893F4JSULPHUROSUM ACIDUMDTXSID7042435S(O)(OH)2SULFUROUS ACID (II)SULFUROUS ACID [II]
Database identifiers
- CAS
14265-45-3、7782-99-2- PubChem CID
- 1100
- DTXSID
DTXSID7042435- ChEMBL
CHEMBL1161699- ChEBI
CHEBI:48854- UNII
- J1P7893F4J
- EC Number
- 231-973-1
- Nikkaji
- J54.364K
Properties
Computed structural properties
- XLogP
- -0.5
- Topological polar surface area
- 76.7 Ų
- Hydrogen bond donors
- 2
- Hydrogen bond acceptors
- 4
- Rotatable bonds
- 0
- Heavy atoms
- 4
- Formal charge
- 0
- Complexity
- 26.3
Experimental & physicochemical properties
Chemical Classes
Toxic Gases & Vapors -> Acids, Inorganic
Corrosives
Food AdditivesUse unspecified -> FDA Substance added to food
Density1.03 @25 °C
Solubility558.5 mg/mL
Physical Description
Sulfurous acid appears as a colorless liquid with a pungent burning sulfur odor. Corrosive to metals and tissue.
Liquid
Clear colorless liquid with a suffocating odor of sulfur dioxide; [Merck Index]
Solid
Safety & regulation
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 0.8% (1 of 130) of reports.
Danger
H314 (95.4%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]
P260, P261, P264, P264+P265, P271, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P363, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 130 reports by companies from 8 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard information
Regulatory Information
Chemical: Sulfurous acid
Sulfurous acid is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Sulfurous acid are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)
The New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.)
DOT LabelCorrosive
Fire Hazards
Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:
· Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Health Hazards
Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:
· TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury or death.
Hazards Summary
Aqueous solution of approximately 6% sulfur dioxide; Gradually oxidized by air forming sulfuric acid; Corrosive; [Merck Index] A strong oxidizing agent; Causes burns; [CAMEO] Human ingestion of 0.5 mg/kg causes diarrhea, other gastrointestinal changes, and nausea or vomiting; [RTECS] Causes burns; Harmful by inhalation; [Alfa Aesar MSDS] See Sulfur dioxide and Sulfuric acid.
DOT ID and Guide1833 154
Reactive GroupAcids, Strong Non-oxidizing
Reactivity ProfileColorless, corrosive, moderately toxic liquid. When heated to decomposition it emits toxic fumes of oxides of sulfur [Lewis, 3rd ed., 1993, p. 1196].
DOT Hazard Classification
Sulfurous acid
UN1833
Class 8 Corrosive material (49 eCFR § 173.136)
PG II: the degree of danger presented by the material is medium
Air and Water ReactionsSoluble in water with release of heat.
Hazard Classes and Categories
Skin Corr. 1B (95.4%)
Corrosives
Safety & protection
Fire FightingExcerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:
Accidental Release Measures
· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.
· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.
First Aid
Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:
General First Aid:
Exposure Control and Personal Protection· Wear positive pressure self-contained breathing apparatus (SCBA).
Nonfire Spill ResponseExcerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:
Isolation and Evacuation
Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:
Immediate precautionary measure
Protective Action Criteria (PAC)
0.20 [ppm]
0.75 [ppm]
30 [ppm]
Personal Protective Equipment (PPE)Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:
Emergency Response Planning GuidelinesSmall Fire
Toxicology
Adverse EffectsDermatotoxin - Skin burns.
Chemistry & industry
Pharmacology
Tissue LocationsBrain
Cellular LocationsMitochondria
Metabolite PathwaysBeta-mercaptolactate-cysteine disulfiduria
Uses & manufacturing
Uses
Used as a dental bleach, reducing agent, and antiseptic; [Merck Index] Permitted for use as an inert ingredient in non-food pesticide products; [EPA]
Using Disinfectants or Biocides [Category: Clean]
U.S. Production2023: 51,128 lb
Industry UsesReducing agent
General Manufacturing Information
Food, beverage, and tobacco product manufacturing
Sulfurous acid: ACTIVE
Related reactions
56 records
Compound notes
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