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|Name:||Tech Grade Sodium Sulfite||Other Name:||Tech Grade Sodium Sulphite Anhydrous|
|Inspection:||SGS||Grade:||Tech Grade, First Grade|
|Usage:||Industrial Bleaching Agent,water Treatment For Pool||Packing:||25 Kgs Paper Bag|
sodium sulfite dechlorination,
sodium sulfite food grade
ANHYDROUS SODIUM SULFITE/SODIUM SULPHITE
FOR WATER TREATMENT
Sodium sulfite is decomposed by even weak acids, giving up sulfur dioxide gas.
Na2SO3 + 2 H+ → 2 Na+ + H2O + SO2
A saturated aqueous solution has pH of ~9. Solutions exposed to air are eventually oxidized to sodium sulfate. If sodium sulfite is allowed to crystallize from aqueous solution at room temperature or below, it does so as a heptahydrate. The heptahydrate crystals effloresce in warm dry air. Heptahydrate crystals also oxidize in air to form the sulfate. The anhydrous form is much more stable against oxidation by air.
|CAS Number||· 7757-83-7|
|3D model (JSmol)||· Interactive image|
|E number||E221 (preservatives)|
|PubChem CID||· 24437|
|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(separate (substances) into constituent elements)|
|Solubility in water||27.0 g/100 mL water (20 °C)|
|Solubility||soluble in glycerol insoluble in ammonia,chlorine|
|Acidity (pKa)||~9 (heptahydrate)|
|Crystal structure||hexagonal (anhydrous)|
|Safety data sheet||ICSC 1200|
Sodium sulfite is primarily used in the pulp and paper industry. It is used in water treatment as an oxygen scavenger agent, to treat water being fed to steam boilers to avoid corrosion problems, in the photographic industry to protect developer solutions from oxidation and (as hypo clear solution) to wash fixer (sodium thiosulfate) from film and photo-paper emulsions, in the textile industry as a bleaching, desulfurizing and dechlorinating agent and in the leather trade for the sulfitization of tanning extracts. It is used in the purification of TNT for military use. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. It is used in the production of sodium thiosulfate. It is used in other applications, including froth flotation of ores, oil recovery, food preservatives, and making dyes.
SODIUM SULFITE is a white odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.
Sodium sulfite forms a bisulfite adduct with aldehydes, and with ketones forms a sulfonic acid. It is used to purify or isolate aldehydes and ketones.
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