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7757-83-7

Basic Information
CAS No.: 7757-83-7
Name: Sodium sulfite
Molecular Structure:
Molecular Structure of 7757-83-7 (Sodium sulfite)
Formula: Na2SO3
Molecular Weight: 126.04
Synonyms: Sulfurous acid, sodium salt;Natrium sulfurosum;disodium sulfite heptahydrate;disodium salt;Sodium sulfite, exsiccated;Sodium sulfite anhydrous;Sulfurous acid, sodium salt (1:2);Sulfurous acid, sodium salt, heptahydrate;Sodium sulfite ,anhydrous;Sodium Sulphite/Sodium Sulphite anhydrous;Natrii sulphis;Sodium sulfite heptahydrate (2:1:7);sodium; sulfurous acid;Natriumsulfid [German];Sulphurous acid, sodium salt;Sodium sulfite solution;EPA Pesticide Chemical Code 078203;Sulftech;Sodium sulfite heptahydrate;Exsiccated sodium sulfite;Sodium sulfite (Na2SO3);Disodium sulfite (Na2SO3);Sulfurous acid,compounds,disodium salt;anhydrous sodium sulphite;Natriumsulfit [German];
EINECS: 231-821-4
Density: 2.63
Melting Point: 500 °C
Boiling Point:
Flash Point:
Solubility: water: 23 g/100 mL (20 °C)
Appearance: white crystals or powder
Hazard Symbols: HarmfulXn
Risk Codes: 31-36/37/38-22-40
Safety: 24/25-36-26-22
Transport Information:
PSA: 82.40000
LogP: -0.13840
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Chemistry

IUPAC Name: Disodium sulfite
Synonyms of Sodium sulphite (CAS NO.7757-83-7): Anhydrous sodium sulfite ; CCRIS 1429 ; Disodium sulfite ; Disodium sulfite (Na2SO3) ; EINECS 231-821-4 ; Exsiccated sodium sulfite ; HSDB 5043 ; Natrii sulphis ; Natrium sulfurosum ; Natriumsulfid ; Natriumsulfid [German] ; Natriumsulfit ; Natriumsulfit [German] ; S-WAT ; Sodium sulfite ; Sodium sulfite (Na2SO3) ; Sodium sulfite anhydrous ; Sodium sulfite, exsiccated  ; Sulftech ; Sulfurous acid, disodium salt ; Sulfurous acid, sodium salt (1:2) ; UNII-VTK01UQK3G
CAS NO: 7757-83-7
Classification Code: Mutation data ; Tumor data
Molecular Formula: Na2O3S
Molecular Weight: 126.0427
Molecular Structure:

Melting Point: 500 °C 
H bond acceptors: 3
H bond donors: 2 
Polar Surface Area: 76.74 Å2
SMILES: [Na+].[Na+].[O-]S([O-])=O
InChI: InChI=1/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
InChIKey: GEHJYWRUCIMESM-NUQVWONBAK
Std. InChI: InChI=1S/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
Std. InChIKey: GEHJYWRUCIMESM-UHFFFAOYSA-L

Uses

The main uses are as follows:
1. Sodium sulphite (CAS NO.7757-83-7) is primarily used in the 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 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.
2. Sodium sulphite 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.
3. Sodium sulphite is used in other applications, including ore flotation, oil recovery, food preservatives, making dyes, and detergent.
4. Sodium sulphite is also used as a preservative to prevent dried fruit from discoloring, and for preserving meats, and is used in the same way as sodium thiosulfate to convert elemental halides to their respective acids, in photography and for reducing chlorine levels in pools.
5. Sodium sulphite forms a bisulfite adduct with aldehydes, and with ketones forms a sulfonic acid. It is used to purify or isolate aldehydes and ketones.

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
cat LDLo intravenous 400mg/kg (400mg/kg)   Archiv fuer Hygiene. Vol. 57, Pg. 87, 1906.
cat LDLo subcutaneous 1300mg/kg (1300mg/kg)   "Abdernalden's Handbuch der Biologischen Arbeitsmethoden." Vol. 4, Pg. 1289, 1935.
dog LDLo subcutaneous 1300mg/kg (1300mg/kg)   "Abdernalden's Handbuch der Biologischen Arbeitsmethoden." Vol. 4, Pg. 1289, 1935.
guinea pig LDLo intravenous 200mg/kg (200mg/kg)   "Abdernalden's Handbuch der Biologischen Arbeitsmethoden." Vol. 4, Pg. 1289, 1935.
guinea pig LDLo subcutaneous 600mg/kg (600mg/kg)   "Abdernalden's Handbuch der Biologischen Arbeitsmethoden." Vol. 4, Pg. 1289, 1935.
mouse LD50 intraperitoneal 950mg/kg (950mg/kg)   Arzneimittel-Forschung. Drug Research. Vol. 31, Pg. 1713, 1981.
mouse LD50 intravenous 175mg/kg (175mg/kg) BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

LUNGS, THORAX, OR RESPIRATION: OTHER CHANGES

LUNGS, THORAX, OR RESPIRATION: RESPIRATORY DEPRESSION
Journal of Pharmacology and Experimental Therapeutics. Vol. 101, Pg. 101, 1951.
mouse LD50 oral 820mg/kg (820mg/kg)   Kenkyu Nenpo--Tokyo-toritsu Eisei Kenkyusho. Annual Report of Tokyo Metropolitan Research Laboratory of Public Health. Vol. 27, Pg. 159, 1976.
rabbit LDLo oral 2825mg/kg (2825mg/kg)   Archiv fuer Hygiene. Vol. 57, Pg. 87, 1906.
rabbit LDLo subcutaneous 600mg/kg (600mg/kg)   Archiv fuer Hygiene. Vol. 57, Pg. 87, 1906.
rat LD50 oral 3560mg/kg (3560mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

SKIN AND APPENDAGES (SKIN): HAIR: OTHER
International Journal of Toxicology. Vol. 19, Pg. 349, 2000.

Safety Profile

Hazard Codes of Sodium sulphite (CAS NO.7757-83-7): HarmfulXn
Risk Statements: 31-36/37/38-22-40 
R31: Contact with acids liberates toxic gas. 
R36/37/38: Irritating to eyes, respiratory system and skin. 
R22: Harmful if swallowed. 
R40: Limited evidence of a carcinogenic effect.
Safety Statements: 24/25-36-26-22 
S24/25: Avoid contact with skin and eyes.
S36: Wear suitable protective clothing. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S22: Do not breathe dust.
WGK Germany: 1
RTECS: WE2150000
F: 3-10
HS Code: 28321000

Specification

Sodium sulfite (CAS NO.7757-83-7) 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.