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Sodium metabisulfite is white or yellow crystalline powder or crystals, with a strong smell of SO2, specific gravity is 1.4, soluble in water, acidic aqueous solution, contact with strong acids are released SO2 and generate the corresponding salts, for a long time in the air and oxidized to Na2S2O6, Products can't exposed to the air for long-term. Higher than 150 ℃ Namely, after the decomposition get SO2. soluble in water, acidic aqueous solution. Soluble in glycerin, slightly soluble in ethanol.