Sodium metabisulfite (Na 2S 2O 5) is an inorganic compound with white or yellow crystals and a strong irritating odor. Dissolved in water, the aqueous solution is acidic, and contact with strong acids will release sulfur dioxide and generate the corresponding salts. If left in the air for a long time, it will be oxidized into sodium sulfate, so sodium metabisulfite cannot be stored for a long time.
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