What is a Sodium metabisulfite (Na₂SO₃)?

Sodium metabisulfite (Na₂SO₃) is the sodium salt of metabisulfurous acid (H₂SO₃) and has the chemical formula Na₂SO₃. It is a colorless crystalline or white powder that is highly soluble in water and has strong reducing properties. Due to these properties, sodium metabisulfite is widely used in various industries, including chemicals and food production. In the food industry, it is commonly used as an antioxidant and bleaching agent to prevent browning and oxidation of fruits and vegetables and is also employed in preserving beverages like wine and juices. It helps to maintain the color and flavor of food products by preventing oxidative changes. In chemical industries, sodium metabisulfite plays an important role in metal surface treatment and in pharmaceutical synthesis. Its reducing properties are utilized in reducing oxides and in various chemical reactions. Additionally, sodium metabisulfite is used in water treatment, especially for purifying industrial and drinking water. However, careful handling is required, as it can react with moisture and acids to release toxic hydrogen sulfide gas. Proper storage and usage are essential for safety.

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