Sodium Metabisulfite (Na2S2O5) is a white, crystalline powder that is widely used in various industries, including food, pharmaceutical, and water treatment, as a reducing agent, preservative, and antioxidant. It is also known as sodium pyrosulfite or disodium metabisulfite and is a compound made up of sodium, sulfur, and oxygen atoms.
The chemical formula for Sodium Metabisulfite is Na2S2O5. It is a white, odorless, and water-soluble solid that readily dissolves in water to form a solution that is slightly acidic. The compound is a salt of sulfurous acid, and it is prepared by reacting sodium bisulfite with sodium hydroxide:
NaHSO3 + NaOH → Na2S2O5 + H2O
The resulting sodium metabisulfite is then purified by crystallization and drying.
Sodium Metabisulfite is commonly used as a food preservative, especially in the preservation of fruits and vegetables. It is also used in the production of wine and beer to prevent oxidation and to sterilize equipment. In the pharmaceutical industry, it is used as a reducing agent and antioxidant in the production of drugs and as a preservative in injectable medications.
