Name: Sodium sulfite

Chemical formula: Na2SO3

Molecular weight: 126.04

CAS Registry Number: 7757-83-7

Melting point: 150°C

Water solubility: easily soluble in water

External view: white, monoclinic crystal or powder

Role and use

1. It is used for the microanalysis and determination of tellurium and niobium and the preparation of developer, and also used as a reducing agent;

2. Used in man-made fiber stabilizer, fabric bleaching agent, photographic developer, dye and bleaching deoxidizer, fragrance and dye reducing agent, papermaking lignin removal agent, etc.;

3. Used as common analytical reagent and photoresistor material;

4. Reducing bleaching agent has a bleaching effect on food and a strong inhibitory effect on oxidase in plant foods.

5. In the printing and dyeing industry, as a deoxidizer and bleaching agent, it is used in the scouring of various cotton fabrics, which can prevent the local oxidation of cotton fibers and affect the fiber strength and improve the whiteness of the scouring product.

6. Used in food industry as bleaching agent, preservative, bulking agent and antioxidant. It is also used in the synthesis of medicine and as a reducing agent when producing dehydrated vegetables

7. Used to make cellulose sulfite, sodium thiosulfate, organic chemicals, bleaching fabrics, etc., and also used as a reducing agent, preservative, dechlorinating agent, etc.;

8. The laboratory is used to prepare sulfur dioxide.