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E224 - Potassium Metabisulfite
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Potassium metabisulfite, or potassium pyrosulfite, is a chemical compound with the formula K2S2O5. It appears as a crystalline white powder in the monoclinic system, soluble in water, with a faint odor of sulfur dioxide (SO2).
E222 - Sodium Bisulfite
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Sodium bisulfite (E222) is a food additive used as a preservative.
Sodium Metabisulfite
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Sodium Metabisulfite or Sodium Pyrosulfite is a yellowish disinfectant, antioxidant, and food preservative. The IUPAC names the S2O5²⁻ ion as the disulfite ion. It should not be confused with the HSO3⁻ ion, which is the former name for hydrogen sulfite.