Molecular formula: Na2S2O5

Molecular weight: 190.10 g/mol

CAS number: 7681-57-4
 

Physical properties:

Appearance: White crystalline powder or granules with a sulfurous odor

Odor: Pungent sulfur odor

Melting point: Decomposes at approximately 150°C (302°F)

Density: 1.48 g/cm³

Solubility: Easily soluble in water, releasing sulfur dioxide (SO2) gas upon dissolution; slightly soluble in alcohol

Appearance change: Hygroscopic in humid air and gradually oxidizes to sodium sulfate (Na2SO4)
 

Chemical properties:

● Redox properties: Acts as a reducing agent in acidic solutions, capable of reducing many metal ions and organic substances; acts as an oxidizing agent in alkaline solutions, capable of oxidizing reducing substances.

● Reactivity:

● Reaction with acids: Produces sulfur dioxide (SO2) gas and the corresponding salt

● Reaction with water: Dissolves to form sodium bisulfite (NaHSO3)

● Decomposition reaction: Decomposes upon heating to form sodium sulfate (Na2SO4) and sulfur dioxide (SO2) gas

specifications:

Applications

Food industry: Used as a preservative, bleaching agent, and antioxidant (e.g., in dried fruits, fruit juices, vegetables).

Chemical industry: Used as a reducing agent and stabilizer (e.g., in dye, leather, and pharmaceutical industries).

Water treatment: Used as a dechlorinating agent in drinking water and wastewater treatment.

Photography industry: Used as a component of developers.

 

Packaging and storage:

Packaging: Typically packaged in moisture-proof bags or plastic drums, common sizes are 25 kg or 50 kg.

Storage: Should be stored in a cool, dry, and well-ventilated place, avoiding moisture and direct sunlight. Keep containers sealed and away from acids and oxidizers.