Sodium sulfite (Na2SO3)-Granules introduce:
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.
Molar mass:126.043 g/mol
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
Acidity (pKa):~9 (heptahydrate)
Refractive index (nD):1.565
Crystal structure:Hexagonal (anhydrous);Monoclinic (heptahydrate)
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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