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7757-83-7
Na2SO3
11160801GN
98%
1-3mm
231-821-4
Characteristic
Sodium sulfite (sodium sulphite) is the inorganic compound with the chemical formula Na2SO3. A pale yellow, water-soluble solid, it is used commercially as an antioxidant and preservative.
Chemical formula:Na2SO3
Molar mass:126.043 g/mol
Appearance:White solid
Odor: Odorless
Density:2.633 g/cm3 (anhydrous);1.561 g/cm3 (heptahydrate)
Melting point: 33.4 °C (92.1 °F; 306.5 K) (dehydration of heptahydrate)
500 °C (anhydrous)
Boiling point: Decomposes
Solubility in water:27.0 g/100 mL water (20 °C)
Solubility: Soluble in glycerol;Insoluble in ammonia, chlorine
log P:−4
Acidity (pKa):~9 (heptahydrate)
Refractive index (nD):1.565
Crystal structure:Hexagonal (anhydrous);Monoclinic (heptahydrate)
Application
Sodium sulfite is used in the photography industry to protect developing solutions from oxidation, in the pulp and paper industry, in water treatment as an oxygen scavenger agent, as a desulfurizing and dechlorinating agent in the leather industry and as a bleaching agent in textile industry. It is used as a preservative to prevent dried fruit from discoloring. It finds application as a sulfonation and sulfomethylation agent in the chemical industry. It is involved in the production of sodium thiosulfate. Other applications include forth flotation ores, oil recovery and making dyes.
Characteristic
Sodium sulfite (sodium sulphite) is the inorganic compound with the chemical formula Na2SO3. A pale yellow, water-soluble solid, it is used commercially as an antioxidant and preservative.
Chemical formula:Na2SO3
Molar mass:126.043 g/mol
Appearance:White solid
Odor: Odorless
Density:2.633 g/cm3 (anhydrous);1.561 g/cm3 (heptahydrate)
Melting point: 33.4 °C (92.1 °F; 306.5 K) (dehydration of heptahydrate)
500 °C (anhydrous)
Boiling point: Decomposes
Solubility in water:27.0 g/100 mL water (20 °C)
Solubility: Soluble in glycerol;Insoluble in ammonia, chlorine
log P:−4
Acidity (pKa):~9 (heptahydrate)
Refractive index (nD):1.565
Crystal structure:Hexagonal (anhydrous);Monoclinic (heptahydrate)
Application
Sodium sulfite is used in the photography industry to protect developing solutions from oxidation, in the pulp and paper industry, in water treatment as an oxygen scavenger agent, as a desulfurizing and dechlorinating agent in the leather industry and as a bleaching agent in textile industry. It is used as a preservative to prevent dried fruit from discoloring. It finds application as a sulfonation and sulfomethylation agent in the chemical industry. It is involved in the production of sodium thiosulfate. Other applications include forth flotation ores, oil recovery and making dyes.
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