SODIUM SULFITE

PRODUCT IDENTIFICATION

7757-83-7

H.S. CODE

CLASSIFICATION

PHYSICAL AND CHEMICAL PROPERTIES

White crystalline powder

Decomposes

AUTOIGNITION

NFPA RATINGS

REFRACTIVE INDEX

GENERAL DESCRIPTION & APPLICATIONS

Sodium Sulfite is a White crystalline or powder; readily soluble in water, decomposes on heating. It is prepared from sulfur dioxide and sodium carbonate or caustic soda. It is a strong reducing agent and reacts with oxidants. It is primarily used in pulp and paper industry. It is used in water treatment as an oxygen scavenger agent , in the photographic industry to protect developer solutions from oxidation, in textile industry as a bleaching, as a desulfurizing and as a dechlorinating agent and in leather trade for the sulfitization of tanning extracts. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. It is used in the production of sodium thiosulfate. It is use in other applications include ore flotation, oil recovery, food preservative, making dyes, and detergent. It forms a bisulfite adduct with aldehyde and with ketones to a sulfonic acid. It is used to purify or  isolate aldehydes and ketones.

APPEARANCE

White crystalline powder

48.8% min

10ppm max

10ppm max

9.5 - 10.5

APPEARANCE

White crystalline powder

50.0% min

5ppm max

0.5ppm max

10ppm max

9.5 - 10.5

APPEARANCE

White crystalline powder

49.5% min

0.015% max

5ppm max

10ppm max

9.5 - 10.5

Acetone Sodium Bisulfite: [CAS RN: 540-92-1, (CH₃)₂C(OH)SO₃Na] Crystals that have a slight sulfur dioxide odor and slightly fatty feel; freely soluble in water, decomposed by acids; used in textile dyeing and printing.

Sodium Formaldehyde Bisulfite [CAS RN: 870-72-4 CH₃NaO₄S] A compound used as a fixing agent for fibers containing keratin, in metallurgy for flotation of lead-zinc ores, and in photography

Glutaraldehyde bis(sodium bisulfite) [CAS RN: 7420-89-5, C₅H₁₂O₈S₂] used as an antiseptic

Menadione Sodium Bisulfite [CAS RN: 57414-02-5, C₁₁H₉NaO₅S] a water-soluble derivative of menadione provitamin which converted in the body to active vitamin K.

Glyoxal sodium bisulfite [CAS RN: 332360-05-1, [CH(OH)SO₃Na]₂] nonaqueous form of glyoxal

OTHER INFORMATION

Sulfate (also spelled sulphate in Europe) is any chemical compound containing the SO₄^2- ion related to sulfuric acid (H₂SO₄). Sulfates are salts or esters of sulfuric acid, formed by replacing one or both of the hydrogens with a metal or a radical as in sodium sulfate, Na₂SO₄. Sulfates in which both hydrogens are replaced are called normal sulfates. Bisulfate is a compound that has the HSO₄^- radical. Bisulfate (called also hydrogen sulfate or acid sulfate) is a compound formed by replacing only one hydrogen in sulfuric acid. Sulfite (also sulphite) is a compound that contain the sulfite ion SO₃^2-. Sulfites are salts or esters of sulfurous acid (H₂SO₃), formed by replacing one or both of the hydrogens with a metal or a radical as in sodium sulfite, Na₂SO₃. Sulfites in which both hydrogens are replaced are called normal sulfites. Bisulfite is a compound that has the HSO₃^- radical. Bisulfate (called also hydrogen sulfite or acid sulfite) is a compound formed by replacing only one hydrogen in sulfurous acid. The term of 'meta' or 'pyro' is the chemical prefix for oxo acid formed through the loss of one water molecule (dehydration) from two molecules of ortho acid by heating. Pyrosulfuric acid is an example ( 2H₂SO₄ - H₂O = H₂S₂O₇). Ortho acid is the compound fully hydrated acid or its salts. Orthophosphoric acid is an example (2·H₃PO₄ = P₂O₅^.3H₂O), in contrast to the less hydrated form, pyrophosphoric acid (2·HPO₃ = P₂O₅^.H₂O). Na₂O₅S₂ is called sodium metabisulfite (2·HNaO₃S - H₂O). Sulfide is a compound having one or more sulfur atoms in which the sulfur is connected directly to a carbon, metal, or other nonoxygen atom; for example sodium sulfide, Na₂S. Sulfide ion is S^2- with oxidation number -2. Bisulfide ion is an anion formed by two sulfur atoms having an overall -2 charge, (S₂)^2-. Sulfamate is a salt of sulfamic acid (HSO₃NH₂). Calcium sulfamate Ca(SO₃NH₂)₂ is an example.