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 Sodium Sulfite
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Spedito - 22/11/2020 :  21:07:51  Mostra profilo  Rispondi allegando il testo

Melting point

500 °C



Refractive index


Storage conditions

Store at RT.


H2O: 1 M at 20 °C, clear, colorless




White to slightly yellow

PH value

9.0-10.5 (25℃, 1M in H2O)

Water solubility

23 g/100 mL (20 oC)






Stable. Incompatible with strong acids. Moisture and air sensitive.

CAS database

7757-83-7(CAS DataBase Reference)

Synonyms: Sodium sulfite anhydrous; SODIUM SULFITE, EXSICCATED; SODIUM SULPHITE; anhydroussodiumsulfite; disodiumsulfite; exsiccatedsodiumsulfite; natriisulphis; natriumsulfid

Overview Sodium sulfite (English Sodium formula: Na2SO3) is an inorganic compound. It is a white granule powder at room temperature with a sulphur dioxide odor, stable on drying and sensitive to moisture. Soluble in water and glycerin, insoluble in ethanol, aqueous solution is alkaline, its aqueous solution is alkaline to litmus paper and phenolphthalein, and produces toxic sulfur dioxide gas with acid. The pH of 1% aqueous solution is 8.3~9.4, strong reduction Sex. It decomposes into sodium sulfide and sodium sulfate when heated, and gradually oxidizes to sodium sulfate when placed in air. In nature, there are three forms of anhydrous sodium sulfite, sodium sulfite and sodium sulfite, among which anhydrous sodium sulfite is the least susceptible to oxidation. Sodium sulfite can be obtained by passing sulfur dioxide into a sodium hydroxide solution, and when the sulfur dioxide is excessive, sodium hydrogen sulfite is formed. Alternatively, sulfur dioxide gas is introduced into the sodium carbonate solution, and after saturation, a sodium carbonate solution is added, and crystallized to obtain a hemihydrate crystal, which is heated and dehydrated to obtain an anhydride.

Sodium sulfite can be used as a developer, preparation of cellulose sulfite, preparation of sodium thiosulfate, preservatives for dried fruits and meats, deoxidizers in the printing and dyeing industry, and as a reducing chemical agent for chemical and laboratory applications. Production and synthesis.
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