Sodium metabisulfite is white or yellow crystalline powder or small crystals, with a strong SO2 odor, specific gravity 1.4, soluble in water, aqueous solution is acidic, and strong acid contact releases SO2 and generates the corresponding salts, long in the air, it is oxidized to Na2S2O6, so the product can not last long. Above 150 degrees Celsius, it breaks down SO2.
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