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Sodium disulfite

CAS 7681-57-4Na2O5S2MW 189.90 g/mol

Sodium disulfite (CAS 7681-57-4) — formula Na2O5S2, molecular weight 189.90 g/mol; category fine chemicals.

Specifications

CAS Number7681-57-4
Molecular FormulaNa2O5S2
Molecular Weight189.90 g/mol
CategoryBasic Chemical Raw Materials

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What this product is

Sodium disulfite is a high-value fine compound with CAS registry number 7681-57-4 and molecular formula Na2O5S2 (molecular weight 189.90 g/mol), belonging to the fine chemicals segment of chemical raw materials.

Identification

CAS number: 7681-57-4

Its molecular formula Na2O5S2 comprises 2 Na, 5 O, 2 S atoms.

Also known as: Sodium disulfite

Category: fine chemicals

Frequently Asked Questions

What is the CAS number of Sodium disulfite?

The CAS registry number of Sodium disulfite is 7681-57-4.

What is the molecular formula and molecular weight of Sodium disulfite?

Molecular formula Na2O5S2, molecular weight 189.90 g/mol.

What other names is Sodium disulfite known by?

It is also registered under: Sodium disulfite.

Which category does Sodium disulfite belong to?

Category: Basic Chemical Raw Materials.

PubChem Public Data

Public-database records for Sodium disulfite (CAS 7681-57-4), reproduced here for independent cross-checking.

Safety classification and hazard statements

GHS notification summary0.4% (11 / 3060)
Reported hazard statementsH302, H318, H317, H334, H335, H402, H412, H320

H302: Harmful if swallowed [Warning Acute toxicity, oral]

H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]

Regulatory listings

Regulatory & Food ContactFDA Substance added to food: ANTIMICROBIAL AGENT, ANTIOXIDANT, COLOR OR COLORING ADJUNCT, DOUGH STRENGTHENER,
ANTIOXIDANT; FLOUR_TREATMENT_AGENT; PRESERVATIVE: Food Additives
ANTIMICROBIAL AGENT, ANTIOXIDANT, COLOR OR COLORING ADJUNCT, DOUGH STRENGTHENER, FLOUR TREATING AGENT, FREEZIN
JECFA ADI: 0-0.7 mg/kg bw
TRS 891-JECFA 51/30
FAS 42-JECFA 51/95
GHS notification summary0.4% (11 / 3060)

Physical description and handling notes

  • Sodium metabisulfite appears as a white crystalline or powder solid with a slight sulfur odor. Toxic by inhalation. Strongly irritates skin and tissue. Noncombustible, but may decompose to emit toxic oxide fumes of sulfur and sodium when heated to high temperature. A corrosive acid when mixed with water. Used as a food preservative and as a laboratory reagent.
  • Dry Powder; Other Solid; Wet Solid; Large Crystals; CBI; Liquid
  • White crystals or crystalline powder
  • White to yellowish crystals or powder with an odor of sulfur dioxide; [NIOSH]
  • WHITE POWDER WITH CHARACTERISTIC ODOUR.
  • White to yellowish crystals or powder with a slight odor of sulfur.

Reported physical properties

溶解度54 % (NIOSH, 2024)
溶解度66.7 g/100 g water at 25 °C
溶解度54%
密度2.36 g/cm³
密度1.4
密度1.4 @25 °C
LogP-3.7
Decomposition150 °C
pH4,0-5,5 (10 % aqueous solution)

How this substance is indexed

CAS Registry Number7681-57-4
PubChem CID656671
分子式Na2S2O5
UNII（FDA）4VON5FNS3C

Documented uses

  • CIR ingredient: Sodium Metabisulfite
  • Sodium and potassium metabisulfite are used as antioxidants in photographic film development. [Kanerva, p. 1637] Used as an antioxidant (food preservative, pharmaceutical aid, silage preservative; [HSDB] Used in the pickling stage of leather production; [PMID 21938525]
  • Leather Tanning and Processing [Category: Industry]
  • Photographic Processing [Category: Other]
  • Sodium Metabisulfite functions as reducing agents in cosmetic formulations. ... Sodium Bisulfite, and Sodium Metabisulfite /also/ function as antioxidants.
  • In foods, as preservative; lab reagent

Names this substance appears under

Sodium metabisulfite; 7681-57-4; Sodium pyrosulfite; Sodium disulfite; Disodium pyrosulfite; Natrii disulfis; Campden Tablets; Disodium metabisulfite; Natrium pyrosulfit; Natriummetabisulfit; sodium pyrosulphite; Sodium bisulfite anhydrous; Natrium metabisulfurosum; Sodium pyrosulfite (Na2S2O5); Disodium pentaoxodisulfate; 4VON5FNS3C

Computed molecular descriptors

分子量190.11
氢键供体数0
氢键受体数6
可旋转键数0
精确质量189.89825401
单同位素质量189.89825401
拓扑极性表面积125
重原子数9
形式电荷0
复杂度136

Database abstract

Sodium Metabisulphite Food Grade · CAS 7681-57-4 · Na2S2O5. UNII 4VON5FNS3C. 溶解度: 54 % (NIOSH, 2024); 溶解度: 66.7 g/100 g water at 25 °C; 溶解度: 54%.

Source: PubChem / Wikidata; the batch COA governs where values differ.

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