S

Sodium sulfite

IUPAC: disodium;sulfite

Na2SO3 Salts CAS 7757-83-7
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Quick Reference
Formula / NotationNa2SO3
CAS Number7757-83-7
Molecular Weight126.05
Melting PointDecomposes (NTP, 1992)
Boiling PointDecomposes (NTP, 1992)
Density2.633 at 59 °F (USCG, 1999) - Denser than water; will sink
SolubilitySoluble in 3.2 parts (NTP, 1992)
AppearanceSodium sulfite is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.
Also Known Asdisodium;sulfite; 7757-83-7; Disodium sulfite; Sodium sulfite anhydrous; Sodium sulphite; Sulfurous acid, disodium salt; Natrium sulfurosum; Sulftech; Natriumsulfid; Natriumsulfit
CategorySalts

What is Sodium sulfite?

Sodium sulfite is an inorganic sodium salt having sulfite as the counterion. It has a role as a reducing agent and a food preservative. It is an inorganic sodium salt and a sulfite salt. It contains a sulfite.

Formula & Notation

Na2SO3

IUPAC Name: disodium;sulfite

Other Names / Synonyms: disodium;sulfite; 7757-83-7; Disodium sulfite; Sodium sulfite anhydrous; Sodium sulphite; Sulfurous acid, disodium salt; Natrium sulfurosum; Sulftech; Natriumsulfid; Natriumsulfit

Properties & Characteristics

Appearance: Sodium sulfite is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.. Molecular formula: Na2O3S. Molecular weight: 126.05 g/mol. Boiling point: Decomposes (NTP, 1992). Melting point: Decomposes (NTP, 1992). Density: 2.633 at 59 °F (USCG, 1999) - Denser than water; will sink. Solubility: Soluble in 3.2 parts (NTP, 1992). Vapor pressure: Negligible (NTP, 1992).

Physical Data

PropertyValue
Melting PointDecomposes (NTP, 1992)
Boiling PointDecomposes (NTP, 1992)
Density2.633 at 59 °F (USCG, 1999) - Denser than water; will sink
Molecular Weight126.05
SolubilitySoluble in 3.2 parts (NTP, 1992)
AppearanceSodium sulfite is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.

Uses & Applications

Used in food preservation, water treatment, chemical synthesis, fertilizers, and pharmaceutical applications.

Safety Information

Irritant or toxic depending on specific salt. Some salts are oxidising agents or toxic to aquatic environments. Consult SDS before use.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Sodium sulfite
Formula Na2SO3
CAS Number 7757-83-7
Molecular Weight 126.05
Category Salts
Index All "S" terms
Synonyms disodium;sulfite; 7757-83-7; Disodium sulfite; Sodium sulfite anhydrous; Sodium sulphite; Sulfurous acid, disodium salt; Natrium sulfurosum; Sulftech; Natriumsulfid; Natriumsulfit

Frequently Asked Questions

Sodium sulfite is an inorganic sodium salt having sulfite as the counterion. It has a role as a reducing agent and a food preservative. It is an inorganic sodium salt and a sulfite salt. It contains a sulfite.

More "S" Terms

S Orbital ψ(1s): spherical; n=1,l=0,ml=0; holds max 2e⁻ Saccharate Saccharic Saccharic Acid Saccharide Safranin C20H19ClN4 Safranine Salicylaldehyde Salicylate Salicylic acid C7H6O3 Salinometer Salt
View all "S" terms →
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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.

AllChemicals.info — The Online Chemical Glossary | https://allchemicals.info/chemical/sodium-sulfite

For educational purposes only. Verify all information before use.