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7757-83-7

Basic Information
CAS No.: 7757-83-7
Name: Sodium sulfite
Article Data: 359
Cas Database
Molecular Structure:
Molecular Structure of 7757-83-7 (Sodium sulfite)
Formula: Na2SO3
Molecular Weight: 126.044
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: N/A
Flash Point: N/A
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: N/A
PSA: 82.40000
LogP: -0.13840
Synthetic route
7757-82-6

sodium sulfate

7757-83-7

sodium sulfite

Conditions
ConditionsYield
With pyrographite In neat (no solvent) redn., 750°C, diameter of C-particels about 0.4mm, 30min;;93%
In neat (no solvent) byproducts: SO2; heating of Na2SO4 in under exclusion of air; evolution of SO2;;
With pyrographite In neat (no solvent) redn., coating of react.-vessel: forsterite;;
With pyrographite In melt melting with sand and coal;;

sodium sulfide

7782-99-2

sulphurous acid

A

7783-06-4

hydrogen sulfide

B

7732-18-5

water

C

sodium thiosulfate

D

7757-83-7

sodium sulfite

Conditions
ConditionsYield
In water a mixt. of 7% SO2 and 93% N2 is introduced into concd. Na2S soln. at 60°C;;A n/a
B n/a
C 46%
D n/a

sodium sulfide

7782-99-2

sulphurous acid

1310-73-2

sodium hydroxide

A

7783-06-4

hydrogen sulfide

B

7732-18-5

water

C

sodium thiosulfate

D

7757-83-7

sodium sulfite

Conditions
ConditionsYield
In water 7 % SO2;A n/a
B n/a
C 37.5%
D n/a

Sodium thiosulfate pentahydrate

A

7757-82-6

sodium sulfate

B

7757-83-7

sodium sulfite

Conditions
ConditionsYield
standing for 2.5 months;A n/a
B 0.015%
With oxygen In neat (no solvent) oxidation at 150°C;;
standing for 2.5 months;A n/a
B 0.015%

dolomite

7446-09-5

sulfur dioxide

7757-82-6

sodium sulfate

7757-83-7

sodium sulfite

Conditions
ConditionsYield
In not given introduction of SO2 into dolomite; reaction of the formed sulfite with Na2SO4;;
20901-21-7, 1190841-11-2

disulfur monoxide

1310-73-2

sodium hydroxide

7757-83-7

sodium sulfite

Conditions
ConditionsYield
In tetrachloromethane with dild. NaOH soln.;
In tetrachloromethane with dild. NaOH soln.;

sodium thiosulfate

A

7757-82-6

sodium sulfate

B

7757-83-7

sodium sulfite

Conditions
ConditionsYield
In neat (no solvent) byproducts: O2, S;

sodium sulfide

7757-83-7

sodium sulfite

Conditions
ConditionsYield
In neat (no solvent) reaction of O3 with Na2S leads to formation of an addn. product as intermediate, which rearranges immediately into Na2SO3;;
In water byproducts: Na2S2O3, Na2S2O4; reaction of aq. Na2S with ozone; formation of Na2SO3 and a small amount of Na2S2O3 and Na2S2O4;;

sodium thiosulfate

A

potassium sulfate

B

chromium(III) chromate

chromium(III) chromate

C

7704-34-9

sulfur

D

7757-83-7

sodium sulfite

Conditions
ConditionsYield
With potassium chromate; magnesium chloride In water byproducts: KCl;
With potassium chromate; water; ammonium chloride In water byproducts: KCl, NH4OH;
With K2CrO4; NH4Cl; H2O In water byproducts: KCl, NH4OH;
With K2CrO4; MgCl2 In water byproducts: KCl;

sodium thiosulfate

A

80937-33-3

oxygen

B

7704-34-9

sulfur

C

7757-82-6

sodium sulfate

D

7757-83-7

sodium sulfite

Conditions
ConditionsYield
With ozone In not given neutral soln.;
With O3 In not given neutral soln.;
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  • Sodium Sulphite Anhydrous CAS NO.7757-83-7

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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.