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Sodium Metabisulphite is an inorganic compound which finds application as antioxidant & preservative in food industry with E number of E223. It has chemical formula Na2S2O5 with molar mass of 190.107 g/mol and density of 1.48 g/cm3. This compound is also used for sanitizing equipments in wine making and brewing sectors. Sodium Metabisulphite appears as white colored powder with faint SO2-like odor and shows melting point of 170 degrees Celsius.