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

Sodium sulfite Na2SO3 (cas 7757-83-7) Molecular Structure

7757-83-7 Structure

Identification and Related Records

【Name】
Sodium sulfite
【CAS Registry number】
7757-83-7
【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(EC#)】
231-821-4
【Molecular Formula】
Na2SO3 (Products with the same molecular formula)
【Molecular Weight】
126.04
【Inchi】
InChI=1/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
【InChIKey】
GEHJYWRUCIMESM-UHFFFAOYSA-L
【Canonical SMILES】
[O-]S(=O)[O-].[Na+].[Na+]
【MOL File】
7757-83-7.mol

Chemical and Physical Properties

【Appearance】
white crystals or powder
【Density】
2.633
【Melting Point】
500 oC
【Refractive Index】
1,484
【Flash Point】
无意义
【Water】
23 g/100 mL (20℃)
【Solubilities】
23 g/100 mL (20 oC)
【Color/Form】
Small crystals or powder
White crystals
【Stability】
Stable. Incompatible with strong acids. Moisture and air sensitive.
【HS Code】
28321000
【Storage temp】
Store at RT.
【Spectral properties】
INDEX OF REFRACTION: 1.565 (powder), 1.515 (prism)
【Computed Properties】
Molecular Weight:126.04274 [g/mol]
Molecular Formula:Na2O3S
H-Bond Donor:0
H-Bond Acceptor:4
Rotatable Bond Count:0
Exact Mass:125.936354
MonoIsotopic Mass:125.936354
Topological Polar Surface Area:82.4
Heavy Atom Count:6
Formal Charge:0
Complexity:18.8
Isotope Atom Count:0
Defined Atom Stereocenter Count:0
Undefined Atom Stereocenter Count:0
Defined Bond Stereocenter Count:0
Undefined Bond Stereocenter Count:0
Covalently-Bonded Unit Count:3

Safety and Handling

【Hazard Codes】
Xn:Harmful
【Risk Statements】
R22;R36/37/38
【Safety Statements 】
S24/25
【Safety】

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

【PackingGroup 】
O52
【Sensitive】
Hygroscopic
【Transport】
82011?
【Formulations/Preparations】
Grades: reagent; technical; FCC.
General Chem Corp (Previously Allied), Stauffer, & VA Chem produce a technical grade sodium sulfite anhydrous with a minimum typical analysis of 96.5%, Granular Technical has a typical analysis of 98.0% with food & photographic grades at 98.6%. Koppers supplies on-purpose material made from sulfur dioxide... with an analysis of 96-97%... Koppers also produces 89-91% material as a by-product of resorcinol manufacture...
【Exposure Standards and Regulations】
This substance is generally recognized as safe when used as a chemical preservative in accordance with good manufacturing practice, except that it is not used in meats; in food recognized as a source of vitamin B1; on fruits and vegetables intended to be served raw to consumers or sold raw to consumers, or to be presented to consumers as fresh.
This substance is generally recognized as safe when used as a chemical preservative in accordance with good manufacturing or feeding practice, except that it is not used in meats or in food recognized as a source of vitamin B1.
【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.

【Disposal Methods】
SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

Use and Manufacturing

【Use and Manufacturing】
Methods of Manufacturing

REACTION OF SULFUR DIOXIDE WITH SODIUM CARBONATE OR BICARBONATE
Sulfur dioxide is reacted with soda ash and water, and soln of resulting sodium bisulfite is treated with addn soda ash; by-product of caustic fusion process for phenol.
U.S. Exports

(1977) ND
(1979) ND
U.S. Imports

(1977) ND
(1979) ND
(1987) 4.54X10+8 g /estimated/
U.S. Production

(1976) 2.22X10+9 G (MIN CONSUMPTION IN FOODS)
(1979) ND
(1987) 9.52X10+10 g /estimated/
Consumption Patterns

End use pattern: pulp & paper, 65%; water & waste treatment, 15%; photography, 10%; oil recovery, 5%; miscellaneous, 5% (1986)
CHEMICAL PROFILE: Sodium Sulfite. Pulp and paper industry, 58%; water treatment, 12%; photography, 9%; miscellaneous, including textile bleaching, food preservatives, chemical intermediate, ore flotation and oil recovery, 13%; exports, 8%.
CHEMICAL PROFILE: Sodium sulfite. Demand: 1986: 130,000 tons; 1987: 133,000 tons; 1991 /projected/: 147,000 tons.
Demand 1997, 100,000 tons; 1998, 102,000 tons; 2002, 107,000 tons /projected, pulp and paper 55%, water treatment 20%, photography 10%, oil recovery 5%, miscellaneous uses 10%.
【Usage】

Chiefly in photographic developers and instead of hypo for fixing prints.

Supplier Location

Top Suppliers

Diamond member Hubei XinRunde Chemical Co., Ltd
Country:ChinaChina
Business Type:Manufacturer
Telephone:86-27-83214668
Diamond member Wuhan Fortuna Chemical Co., Ltd.
Country:ChinaChina
Business Type:Manufacturer
Telephone:0086-27-59207850
Diamond member Nanjing Chemlin Chemical Co., Ltd.
Country:ChinaChina
Business Type:Manufacturer
Telephone:86-25-83697070
Diamond member AOPHARM
Country:ChinaChina
Business Type:Manufacturer
Telephone:86-311-66600578
Diamond member Hangzhou J&H Chemical Co., Ltd
Country:ChinaChina
Business Type:Manufacturer
Telephone:86-571-87396430
Changsha Yonta Industry Co., Ltd
Country:ChinaChina
Business Type:Distributor/Wholesaler
Telephone:86-731-85352228
Finetech Industry limited.
Country:ChinaChina
Business Type:Manufacturer
Telephone:86-27-87465837
shijiazhuang xinlongwei chemical co,ltd
Country:ChinaChina
Business Type:Manufacturer
Telephone:86-155-11419711
Jinan Haohua Industry Co., Ltd.
Country:ChinaChina
Business Type:Manufacturer
Telephone:0086-531-58773055
Tai`an Ming Chen Chemical Import&Export Co.,Ltd.
Country:ChinaChina
Business Type:Manufacturer
Telephone:86-538-6301415

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