7757-83-7 structure, Na2O3S

Sodium sulfite

CAS No.

7757-83-7

Formula:

Na2O3S

Basic Info

Sodium sulfite (sodium sulphite) is a soluble sodium salt of sulfurous acid (sulfite) with the chemical formula Na2SO3. It is a product of sulfur dioxide scrubbing, a part of the flue-gas desulfurization process. It 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 halogens to their respective hydrohalic acids, in photography and for reducing chlorine levels in pools.

Formula
Na2O3S
Molecular Weight
126.043
Exact Mass
125.936
LogP
-0.1384
PSA
82.4
Synonyms

anhydrous sodium sulphite

Natrii sulphis

Sodium sulphite

Sodium sulfite anhydrous

disodium,sulfite

Sulftech

SODIUM SULFITE

Sulfurous acid,disodium salt

Sodium sulfite solution

Disodium sulfite

Natrium sulfurosum

sodium sulphite powder

expand collapse

Properties

Appearance & Physical State
white crystals or powder
Density
2.633
Melting Point
500ºC
Refractive Index
1.484
Water Solubility
23 g/100 mL (20 ºC)
Stability
Stable. Incompatible with strong acids. Moisture and air sensitive.
Storage Condition
Store at RT.

Safety Info

RTECS
WE2150000
Safety Statements
S24/25
WGK Germany
1
Risk Statements
R22; R36/37/38
HS Code
2832100000
Hazard Codes

Synthesis Route

Related Compound Information