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Best price of Sodium Sulfite Anhyrous in stock and in bulk supply
Cas No: 7757-83-7
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Sodium sulfite anhydrous 96% 97% sodium sulphite
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Sodium Sulphite Anhydrous
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Sodium Sulphite Anhydrous CAS NO.7757-83-7
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Sodium sulfite
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7757-83-7 Usage

Reactivity Profile

Sodium sulfite is a reducing agent, particularly under basic conditions. Reacts with oxidizing agents such as peroxides, epoxides, oxoacids. Emits toxic fumes of sodium oxide and oxides of sulfur if heated to decomposition [Lewis, 3rd ed., 1993, p. 1174].

Description

As a soluble sodium salt of sulfurous acid, Sodium sulfite (Na2SO3) shows blenching, de-sulfurizing and dechlorinating properties which is widely applied in various fields. It is primarily used in the pulp and papermaking industry due to its blenching activity. It can serve as a good additive to help preserve the fresh appearance of good products. Besides, sodium sulfite is a component in many pharmaceuticals, which is effective to maintain the potency and stability of drugs. It can also be applied for water treatment as an oxygen scavenger agent and applied in flue gas desulfurization and preservation of photo developer solutions, etc.

Health Hazard

When ingested, solutions cause gastric irritation by the liberation of sulfurous acid. Because of rapid oxidation to sulfate, sulfites are well tolerated until large doses are reached; then violent colic and diarrhea, circulatory disturbances, central nervous depression, and death can occur.

Chemical Properties

Sodium sulfite,Na2S03, is a white,water-soluble, crystalline solid with a sulfurous, salty taste. It decomposes when heated. Sodium sulfite is used as a source of sulfite,as a chemical intermediate and food preservative, in medicine and paper manufacturing, in photographic developing, and as a bleaching agent in the textile industry. Most boiler operators use sodium sulfite for chemicals cavenging of oxygen in the feedwater. Because it decomposes into acidic gases at the high temperatures that accompany high pressures, sodium sulfite should not be used for this purpose at pressures above 122atm (12.4MPa,or 1.8 ksi).

Purification Methods

Crystallise the sulfite from warm water (0.5mL/g) by cooling to 0o. Also purify it by repeated crystallisation from deoxygenated water inside a glove-box, and finally drying it under vacuum. [Rhee & Dasgupta J Phys Chem 89 1799 1985.]

References

https://en.wikipedia.org/wiki/Sodium_sulfite
https://pubchem.ncbi.nlm.nih.gov/compound/24437#section=Top
http://www.calabriancorp.com/product/sodium-sulfite-anhydrous
http://www.livestrong.com/article/108427-list-foods-sulfite-allergies/

Fire Hazard

Literature sources indicate that Sodium sulfite is noncombustible.

Air & Water Reactions

Soluble in water. Reacts with hot water, steam or acids to produce corrosive material.

Definition

ChEBI: An inorganic sodium salt having sulfite as the counterion.

Contact allergens

Sodium sulfite is mainly used in photographic developers, for fixing prints, bleaching textile fibers, as a reducer in manufacturing dyes, as a remover of Cl in bleached textiles and paper, and as a preservative in the food industry for meat, egg yolks, and so on.

General Description

White odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.
InChI:InChI=1/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2

7757-83-7 Well-known Company Product Price

Brand (Code)Product description CAS number Packaging Price Detail
Sigma-Aldrich (S4672)  Sodiumsulfite  BioXtra, ≥98% 7757-83-7 S4672-1KG 1,157.13CNY Detail
Sigma-Aldrich (S4672)  Sodiumsulfite  BioXtra, ≥98% 7757-83-7 S4672-250G 404.82CNY Detail
Sigma-Aldrich (S4672)  Sodiumsulfite  BioXtra, ≥98% 7757-83-7 S4672-100G 278.46CNY Detail
Sigma-Aldrich (S0505)  Sodiumsulfite  ≥98% 7757-83-7 S0505-2.5KG 1,463.67CNY Detail
Sigma-Aldrich (S0505)  Sodiumsulfite  ≥98% 7757-83-7 S0505-250G 386.10CNY Detail
Sigma-Aldrich (13471)  Sodiumsulfite  puriss., meets analytical specification of Ph.?Eur., BP, NF, anhydrous, 95.0-100.0% (iodometric) 7757-83-7 13471-6X2.5KG-R 6,411.60CNY Detail
Sigma-Aldrich (13471)  Sodiumsulfite  puriss., meets analytical specification of Ph.?Eur., BP, NF, anhydrous, 95.0-100.0% (iodometric) 7757-83-7 13471-2.5KG-R 2,331.81CNY Detail
Sigma-Aldrich (13471)  Sodiumsulfite  puriss., meets analytical specification of Ph.?Eur., BP, NF, anhydrous, 95.0-100.0% (iodometric) 7757-83-7 13471-1KG-R 1,240.20CNY Detail
Sigma-Aldrich (31454)  Sodiumsulfite  puriss. p.a., Reag. Ph. Eur., anhydrous, 98-100.0% (iodometric) 7757-83-7 31454-4X5KG 10,787.40CNY Detail
Sigma-Aldrich (31454)  Sodiumsulfite  puriss. p.a., Reag. Ph. Eur., anhydrous, 98-100.0% (iodometric) 7757-83-7 31454-5KG 3,013.92CNY Detail
Sigma-Aldrich (31454)  Sodiumsulfite  puriss. p.a., Reag. Ph. Eur., anhydrous, 98-100.0% (iodometric) 7757-83-7 31454-1KG 896.22CNY Detail
Sigma-Aldrich (31454)  Sodiumsulfite  puriss. p.a., Reag. Ph. Eur., anhydrous, 98-100.0% (iodometric) 7757-83-7 31454-500G 497.25CNY Detail

7757-83-7SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 16, 2017

Revision Date: Aug 16, 2017

1.Identification

1.1 GHS Product identifier

Product name sodium sulfite

1.2 Other means of identification

Product number -
Other names Sulfurous acid,disodium salt

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

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