Chinese alias: partial sodium sulfite; sodium disulfite; heavy sulfur; pyrosulfite; sodium metabisulfite; sodium metabisulfite; edible sodium metabisulfite.

CASRN: 7681-57-4

InchI coding: InChI=1/2Na.H2O5S2/c;;1-6(2)5-7(3)4/h;;(H,1,2)(H,3,4)/q2*+1;/p-2[2]

Appearance: white or yellowish crystalline powder or small crystal..

Product specifications: sulfur dioxide ≥ 65%

Iron ≤ 0.005%

Water insoluble matter ≤ 0.05%

PH value 4.0-4.6

Chemical name

Chemical Chinese name: sodium metabisulfite

Chemical English name: sodium metabisulfite

Chinese name 2: sodium metabisulfite

English name 2: sodium pyrosulfite / sodium metabisulphite

Technical specification code: 1333

Composition and composition

Hazardous ingredients

Sodium metabisulfite 7681-57-4

Category: Antioxidants.

Trait use

Review

Sodium metabisulfite; heavy sodium sulfite; heavy sulfur; sodium metabisulfite; sodium pyrosulfite molecular formula Na2S2O5 molecular weight 190.10 CAS No. 7681-57-4

Physical and chemical properties

Main ingredients: pure product

Appearance and traits: colorless prismatic crystal or white powder; sulfur dioxide taste, acid, salty;

Melting point (°C): >300 (decomposition)

Boiling point (°C): no data

Relative density (water = 1): 1.48

Solubility: Soluble in water, the aqueous solution is acidic (54 g / 100 ml water at 20 ° C; 81.7 g / 100 ml water at 100 ° C). Soluble in glycerin, slightly soluble in ethanol. The relative density is 1.4. Soluble in water, soluble in glycerin, slightly soluble in ethanol. It is easily decomposed by moisture and easily oxidized to sodium sulfate in exposed air. Contact with strong acid releases sulfur dioxide to form the corresponding salt. Heat to 150 ° C decomposition.

Stability and reactivity

Incompatible materials: strong acid, strong oxidant.

Conditions to avoid: humid air.