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CAS number: 7757-83-7 Yes
PubChem: 24437
ChemSpider: 22845 Yes
RTECS number: WE2150000
Solubility in water: 67.8 g / 100 ml (18 ° C, heptahydrate)
Solubility: insoluble in soluble ammonia in glycerol
Molecular 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 (heptahydrate dehydration) 500 ° C (anhydrous)
Boiling point: (separating the constituent elements (substances)) decomposes
Acidity (pKa): ~ 9 (heptahydrate)
Refractive Index (nD): 1.565
Structure: Crystal structure

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General Information

Chemical formula of Na2SO3, white, unstable, protective chemical structure is a reducing agent. In acidic conditions sulfuric acid forms. It is used as a good preservative as well as oxidizing and bleaching agents to prevent decolorization.

Production and Reactions

Sodium sulfite solution can be prepared in laboratory environment as a result of sulfur dioxide gas and sodium hydroxide reaction.
2 NaOH SO2? Na2SO3 H2O

When reacted with concentrated hydrochloric acid, the aqueous sodium sulfite return can take place.

Na2SO3 2 HCl? 2 NaCl SO2 H2O
Sodium sulfite can form bisulfite addition with aldehydes. Sodium sulphate can be obtained by interaction with oxygen.

Usage areas

It is used in the industry as an oxygen scavenging agent and in photographic paper emulsions.

It is used in the form of a hypo-clear solution in the water treatment industry.

It is used in TNT purification especially in military sector.

It is used in many reactions and in production of sodium thiosulphate by making use of bi-directional reaction in laboratory environment.

In the food sector, E 221 is used in many parts. It is used as a part function enhancer in improving the kneading capacity of bread.

It is used in stabilization of latex in this sector.

It is used for the production of paper pulp, rags (ordinary newspaper) and for the disintegration of the straw.

It has been used in many sectors such as foam flotation, oil recovery, food preservatives, dyes and making ores.

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