Basic information
- CAS
10117-38-1- Standard SMILES
O=S([O-])[O-].[K+].[K+]- InChIKey
BHZRJJOHZFYXTO-UHFFFAOYSA-L- Molecular formula
- K2O3S
- Average molar mass
- 158.26 g/mol
- Monoisotopic mass
- 157.884228
Names & identifiers
- Preferred name
- Potassium Sulfite
- IUPAC
- dipotassium;sulfite
- English name
- POTASSIUM SULFITE
- Molecular formula
- H3KO3S
- Molecular weight
- 122.18
Names & synonyms
POTASSIUM SULFITE10117-38-1Dipotassium sulfitePotassium sulphiteSulfurous acid, dipotassium saltPotassium sulfite (K2SO3)Sulfurous acid, potassium saltDIPOTASSIUM SULPHITEUNII-015KZC652EINS NO.225HSDB 5052015KZC652E
Show more names
KaliumsulfitdipotassiumsulfitePotassium sulfide anPotassium sulfite,ARPotassium sulfite ,95%potassiumsulfite(k2so3)POTASSIUMSULFITE,POWDERPotassiumsulfite,anhydrous
EINECS 233-321-1POTASSIUM SULFITE [MI]POTASSIUM SULFITE [FCC]POTASSIUM SULFITE [HSDB]DTXSID80889532INS-225EC 233-321-1E-225
Database identifiers
- CAS
10117-38-1- PubChem CID
- 24958
- DTXSID
DTXSID80889532- UNII
- 015KZC652E
- EC Number
- 233-321-1
- Nikkaji
- J43.951G
Properties
Computed structural properties
- Topological polar surface area
- 82.4 Ų
- Hydrogen bond donors
- 0
- Hydrogen bond acceptors
- 4
- Rotatable bonds
- 0
- Heavy atoms
- 6
- Formal charge
- 0
- Complexity
- 18.8
Experimental & physicochemical properties
Chemical ClassesOther Classes -> Sulfites
Cosmetics
Cosmetic ingredients (Potassium Sulfite) -> CIR (Cosmetic Ingredient Review)
Reducing; Preservative
Food AdditivesUse unspecified -> FDA Substance added to food
Solubility
White crystals or crystalline powder; sol in about 3.5 parts water; decomposed by diluted acids with evolution of sulfur dioxide; pH about 8 /dihydrate/
White-yellowish, hexagonal form; insol in ammonia; slightly sol in alcohol /dihydrate/
Physical Description
Liquid
Dihydrate: White solid; Slowly oxidized by air to sulfate; [Merck Index] White powder; [MSDSonline]
Stability/Shelf LifeGRADUALLY OXIDIZES IN AIR TO SULFATE. /DIHYDRATE/
Other Experimental PropertiesDecomposes on heating /dihydrate/
Physicochemical properties
Safety & regulation
Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 81.5% (242 of 297) of all reports.
Warning
H315 (16.5%): Causes skin irritation [Warning Skin corrosion/irritation]
P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 297 reports by companies from 10 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Danger
Hazard information
Regulatory Information
Chemical: Sulfurous acid, dipotassium salt
Sulfurous acid, potassium salt (1:2) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Sulfurous acid, potassium salt (1:2) 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)
REACH registered substance: Potassium sulphite (EC: 233-321-1)
Sulfurous acid, dipotassium salt: Does not have an individual approval but may be used as a component in a product covered by a group standard. It is not approved for use as a chemical in its own right.
Other Safety InformationIMAP assessments - Sulfurous acid, dipotassium salt: Environment tier I assessment
Hazards SummaryAn irritant; [MSDSonline] See SULFITES.
Hazard Classes and Categories
Skin Irrit. 2 (16.5%)
Acute toxicity - category 4
Safety & protection
Chemistry & industry
Uses & manufacturing
Uses
CIR ingredient: Potassium Sulfite
Used in photography, food and cosmetics (preservative and antioxidant), and drugs (cathartic and diuretic); [HSDB]
Photographic Processing [Category: Other]
Photography; preservative and antioxidant in foods
Medication: cathartic, diuretic
COMPONENT OF PHOTOGRAPHIC DEVELOPERS; FOOD ADDITIVE (EG, PRESERVATIVE & ANTIOXIDANT); INGREDIENT IN COSMETICS (EG, HAIR PREPARATIONS)
U.S. Exports
(1977) No Data
(1979) No Data
U.S. Imports
(1977) No Data
(1979) No Data
U.S. Production
2023: 100,000,000 - <250,000,000 lb
(1977) No Data
(1979) No Data
Consumer UsesEtching agent
Industry UsesReducing agent
Methods of ManufacturingPROBABLY BY THE ABSORPTION OF SULFUR DIOXIDE IN POTASSIUM CARBONATE OR POTASSIUM HYDROXIDE
Formulations/PreparationsGrades: technical; CP; FCC.
Use Classification
Food Additives -> ANTIOXIDANT; PRESERVATIVE -> JECFA Functional Classes
Cosmetics -> Reducing; Preservative
General Manufacturing Information
Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing
Sulfurous acid, potassium salt (1:2): ACTIVE
Applications
Related reactions
3 records
Compound notes
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