Sodium Meta Bi Sulphite

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Sodium Pyrosulfite

CAS Number:7681‑57‑4

Synonyms:Sodium metabisulfite; Sodium pyrosulfite; Sodium disulfite; E223

Chemical Formula:Na₂S₂O₅

Molecular Weight:190.11 g/mol

Product Introduction

A white to slightly yellow crystalline or powdered solid with a faint sulfur dioxide odor. Commonly used as a disinfectant, antioxidant, preservative (food & beverage, e.g., winemaking), bleaching agent, and oxygen scavenger in industrial processes

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Physical & Chemical Properties

Property Value
Appearance White to yellowish powder/crystals
Odor Faint SO₂
Density 1.48 g/cm³
Melting Point ≈ 150–170 °C (decomp. above)
Solubility (H₂O @20 °C) ≈ 65 g/100 mL; increases with temp
Solubility (Ethanol) Slight
pH (20 °C, 5% soln.) ≈ 3.5–5.0
NFPA (H‑F‑R) 2‑0‑1

Applications

  • Food & beverage: antioxidant/preservative (e.g., winemaking)
  • Disinfection & bleaching: pulp, photography, water treatment
  • Laboratory reagent: HPLC standards, oxygen scavenger
  • Industrial:dechlorination, antioxidant in solutions

Safety & Handling:

  • May release SO₂—irritant to respiratory tract, eyes, skin. Allergic reactions in sulfite-sensitive individuals. GHS: H302, H318. Use PPE, ventilated conditions. Store dry, tightly sealed.

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