Sodium sulfite
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Description
White, crystalline powder. Sodium sulfite is primarily used as a reducing agent in photographic fixers and as a replacement for 'hypo' (Sodium thiosulfate). It is also used for bleaching Wool, Straw, and Silk. Sodium sulfite acts as an antichlor for the removal of Chlorine in bleached textiles and Paper, but it can leave a residual Sulfur odor. It is also used for silvering Glass and preserving food.
Synonyms and Related Terms
sodium sulphite; disodium salt of sulfurous acid; disodium sulfite
Risks
- Emits toxic fumes when heated.
- Inhalation of powder may cause asthmatic reactions.
- ThermoFisher: SDS
Physical and Chemical Properties
- Soluble in water, glycerol.
- Solutions smell sulfurous.
- Insoluble in ethanol.
| Composition | NaSO3 |
|---|---|
| CAS | 7757-83-7 |
| Melting Point | 600 C (dec) |
| Density | 2.633 g/ml |
| Molecular Weight | mol. wt. = 126.06 |
| Refractive Index | 1.565, 1.515 |
Resources and Citations
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 8831
- Photographic chemical at www.jetcity.com/~mrjones/chemdesc.htm
- CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index= 1.565, 1.515
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998