Sodium pyrosulfite

Sodium Pyrosulfite (Na₂S₂O₅)

Basic Info

• CAS Number: 7681-57-4

• Molecular Formula: Na₂S₂O₅

• Molar Mass: 126.04 g/mol

• Product Code: S818094

• Pack Size: 500 g

• Grade: Laboratory/Analytical Grade

• Appearance: White to yellowish crystalline powder

• Odor: Sulfur-like odor

• Solubility: Soluble in water

• Density: ~1.48 g/cm³

• Stability: Stable under dry conditions; reacts with acids and moisture

• Reactivity: Acts as a reducing agent; releases sulfur dioxide when in contact with acids or water

  Product Description

  Sodium pyrosulfite is a high-purity inorganic compound widely used in laboratory research, chemical synthesis, and industrial applications. It is particularly valued for its reducing properties and ability to release sulfur dioxide, making it suitable for preservation, bleaching, and water treatment processes.

  Common applications include:

  • Laboratory reagent in analytical chemistry

  • Reducing agent in organic and inorganic reactions

  • Food and beverage industry as a preservative (E223)

  • Water treatment to remove excess chlorine or oxygen

  Sodium pyrosulfite is moisture-sensitive and should be stored in airtight, dry containers. Protective equipment such as gloves and goggles is recommended during handling.