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CAS 7681-57-4

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Sodium pyrosulfite

Description:
Sodium pyrosulfite, also known as sodium metabisulfite, is an inorganic compound with the chemical formula Na2S2O5. It appears as a white to yellowish crystalline powder and is highly soluble in water, producing a solution that is acidic in nature. This compound is commonly used as a preservative and antioxidant in food and beverage industries, particularly in wine and dried fruits, due to its ability to inhibit microbial growth and oxidation. Sodium pyrosulfite releases sulfur dioxide when dissolved in water, which contributes to its preservative properties. Additionally, it finds applications in various industrial processes, including photography, textile manufacturing, and as a reducing agent in chemical reactions. While generally considered safe in regulated amounts, exposure to high concentrations can cause respiratory irritation and allergic reactions in sensitive individuals. Proper handling and storage are essential to mitigate any potential hazards associated with this compound.
Formula:H2O5S2·2Na
InChI:InChI=1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)
InChI key:InChIKey=ZBVPOSMABOMSMZ-UHFFFAOYSA-N
SMILES:S(S(=O)O)(=O)(=O)O.[Na]
Synonyms:
  • Campden Tablets
  • Colorstrip Catalyst 100
  • Dinatriumdisulfit
  • Disodium Disulphite
  • Disodium disulfite
  • Disodium metabisulfite
  • Disodium pyrosulfite
  • Disodium pyrosulfite (Na2S2O5)
  • Disodium pyrosulfite (Na<sub>2</sub>S<sub>2</sub>O<sub>5</sub>)
  • Disulfite de disodium
  • See more synonyms
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