Sodium metabisulfite (also known as sodium pyrosulfite or sodium disulfite) is a white or yellowish crystalline powder with a pungent sulfur dioxide-like odor. It is used as a food preservative, as a bleaching agent in the production of paper and textiles, and as a reducing agent in the chemical industry. Sodium metabisulfite is also used in the production of some medications, such as acetaminophen, and in the treatment of wastewater to remove chlorine.
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