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Sodium Metabisulfite is a white to slightly yellowish crystalline powder with sulfur dioxide odor; readily soluble in water. Sodium metabisulfite containing more than 65.0% SO2 w/w releases sulfur dioxide gas when mixed with water.
It forms a bisulfite adduct with aldehyde and with ketones to a sulfonic acid. It is used to purify or isolate aldehydes and ketones. Sodium metabisulfite's reductive and sulfonating properties provide versatile applications. It is used as an oxygen scavenger to eliminate the dissolved oxygen in waste water and in pipes.
Bisulfite is a reductive bleaching agent. It reduces carbonyl and alcohol groups, which function as colorants of the substances. It is used in bleaching mechanical paper pulp, cotton, wool and kaolin clay. Additional applications include as a preservative (antioxidant), a hair waving agent, and Ensiling agent. Bisulfites are used in industries concerned with leather processing, food and beverage processing, gas purification, water treatment to remove excess chlorine, textiles and pulp processing, and many others.
It is used as a reducing agent in chemical manufacturing. It is an alternative to sulfur dioxide which is used in sterlization of equipment.
Examples of other metallic bisulfite
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Calcium Bisulfite [13780-03-5, Ca(HSO3)2] A white powder, used as an antiseptic and in pulping process.
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Potassium Bisulfite [1310-61-8, KHSO3] Also called potassium acid sulfite, white, water-soluble powder with sulfur dioxide odor; insoluble in alcohol; decomposes when heated; used as an antiseptic and reducing chemical, tanning, and bleaching.
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Magnesium Bisulfite [13774-25-9, Mg(HSO3)2]
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