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Sodium Metabisulfite is an inorganic compound composed of sodium, sulfur, and oxygen, commonly used as a disinfectant, antioxidant, and preservative in various industries.

🏭⚗️ Production
Sodium metabisulfite is typically produced by bubbling sulfur dioxide gas into a sodium carbonate or sodium hydroxide solution. The resulting sodium bisulfite solution is then evaporated and crystallized to form sodium metabisulfite as a white or yellowish powder. The compound is usually handled and stored in solid form for stability and ease of transport.

🔬 Properties
Sodium metabisulfite appears as a white to yellowish crystalline powder or solid with a sharp sulfurous odor. Its chemical formula is Na₂S₂O₅, and it is highly soluble in water, forming an acidic solution. When dissolved, it releases sulfur dioxide, which accounts for its preservative and antimicrobial effects. The compound is stable under dry conditions but decomposes in moist air, especially at elevated temperatures, releasing sulfur dioxide gas.

🧪 Applications
Sodium metabisulfite is widely used as a preservative and antioxidant in the food and beverage industry, particularly in wine, dried fruits, and canned vegetables. In water treatment, it is used to dechlorinate water before discharge or reuse. It is also employed in the textile and paper industries for bleaching and as a reducing agent in chemical processing. In photography and pharmaceuticals, it serves as a stabilizer and sterilizing agent. In laboratories, it is used to quench reactions or remove excess chlorine or bromine.

⚠️ Safety
Sodium metabisulfite can cause irritation to the skin, eyes, and respiratory tract, particularly in people with asthma or sulfite sensitivity. Inhalation of dust or vapors may lead to allergic reactions or respiratory distress. It should be handled in well-ventilated areas, and appropriate protective equipment, such as gloves, masks, and goggles, should be used. The compound should be stored in tightly sealed containers away from moisture, acids, and oxidizing agents. Disposal should be carried out in accordance with local environmental and safety regulations.