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Na2SO3 97% Purity Sodium Sulfite Preservative Density 2.633 g /cm3 White Powder

Categories Sodium Sulfite Water Treatment
Brand Name: Kemsky
Model Number: sodium sulfite water treatment CAS No:7757-83-15
Certification: ISO 9001 SGS
Place of Origin: Hunan
MOQ: 1 metric ton
Price: usd 510 per metric ton
Payment Terms: T/T , L/C
Supply Ability: 3000 tons per month
Delivery Time: 5-8 days
Packaging Details: 25 kgs bag,1000 kgs big bag
name: SSA sodium sulfite CAS No:7757-83-15
other name: SSA anhydrous sodium sulphite CAS No:7757-83-15
color: white powder
usage: industrial use
packing: 25 kgs plastic woven bag/paper bag
loading capacity: 27 tons per container
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    Na2SO3 97% Purity Sodium Sulfite Preservative Density 2.633 g /cm3 White Powder



    Sodium sulfite is primarily used in the pulp and paper industry. It is used in water treatment as an oxygen scavenger agent, to treat water being fed to steam boilers to avoid corrosion problems,[2] in the photographic industry to protect developer solutions from oxidation and (as hypo clear solution) to wash fixer (sodium thiosulfate) from film and photo-paper emulsions, in the textile industry as a bleaching, desulfurizing and dechlorinating agent and in the leather trade for the sulfitization of tanning extracts. It is used in the purification of TNT for military use. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. It is used in the production of sodium thiosulfate. It is used in other applications, including froth flotation of ores, oil recovery, food preservatives, and making dyes.
    SODIUM SULFITE is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.


    Sodium sulfite forms a bisulfite adduct with aldehydes, and with ketones forms a sulfonic acid. It is used to purify or isolate aldehydes and ketones.
    Sodium sulfite (sodium sulphite) is a soluble sodium salt of sulfurous acid (sulfite) with the chemical formula Na2SO3. It is a product of sulfur dioxide scrubbing, a part of the flue-gas desulfurization process. It is also used as a preservative to prevent dried fruit from discoloring, and for preserving meats, and is used in the same way as sodium thiosulfate to convert elemental halogens to their respective hydrohalic acids, in photographyand for reducing chlorine levels in pools.
    Sodium Sulfite is a white crystal or powder with reducing property. Sodium sulfite exhibits bleaching, de-sulfurizing, and dechlorinating activities. This agent was used by food industry to help maintain the fresh appearance of food products. It is also a component in many drugs, which helps maintain their potency and stability. FDA has ruled sodium sulfite a new animal drug of low regulatory priority.

    Sodium sulfite
    Other names
    Hypo clear(photography)
    CAS Number· 7757-83-7
    3D model (JSmol)· Interactive image
    ChEBI· CHEBI:86477
    ChemSpider· 22845
    ECHA InfoCard100.028.929
    EC Number231-821-4
    E numberE221 (preservatives)
    PubChem CID· 24437
    RTECS numberWE2150000
    Chemical formulaNa2SO3
    Molar mass126.043 g/mol
    Appearancewhite solid
    Density2.633 g/cm3 (anhydrous)
    1.561 g/cm3 (heptahydrate)
    Melting point33.4 °C (92.1 °F; 306.5 K) (dehydration of heptahydrate)
    500 °C (anhydrous)
    Boiling pointDecomposes(separate (substances) into constituent elements)
    Solubility in water27.0 g/100 mL water (20 °C)
    Solubilitysoluble in glycerol insoluble in ammonia,chlorine
    log P-4
    Acidity (pKa)~9 (heptahydrate)
    Refractive index(nD)1.565
    Crystal structurehexagonal (anhydrous)
    monoclinic (heptahydrate)
    Safety data sheetICSC 1200

    Descriptive chemistry

    Sodium sulfite is decomposed by even weak acids, giving up sulfur dioxide gas.
    Na2SO3 + 2 H+ → 2 Na+ + H2O + SO2
    A saturated aqueous solution has pH of ~9. Solutions exposed to air are eventually oxidized to sodium sulfate. If sodium sulfite is allowed to crystallize from aqueous solution at room temperature or below, it does so as a heptahydrate. The heptahydrate crystals effloresce in warm dry air. Heptahydrate crystals also oxidize in air to form the sulfate. The anhydrous form is much more stable against oxidation by air.

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