Sodium bisulfite
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Description
White crystals or powder. Sodium bisulfite is used as a Disinfectant and bleach, especially for wool and leather. It is also used as a bleach, digestive aid, and antichlor in papermaking vats. Sodium bisulfite is also used in photographic developing solutions and dye baths as a reducing agent.
Synonyms and Related Terms
sodium acid sulfite; sodium hydrogen sulfite; sodium metabisulfite; sodium pyrosulfite
Risks
- Noncombustible.
- Contact causes irritation and burns.
- Toxic by ingestion.
- Reacts with acids to evolve toxic sulfur dioxide fumes.
- ThermoFisher: SDS
Physical and Chemical Properties
Soluble in water. Insoluble in ethanol.
| Composition | NaHSO3 |
|---|---|
| CAS | 7631-90-5 |
| Melting Point | 150 C |
| Density | 1.48 g/ml |
| Molecular Weight | mol. wt. = 104.06 |
| Refractive Index | 1.474, 1.526, 1.685 |
Resources and Citations
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 785
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
- The Dictionary of Paper, American Paper Institute, New York, Fourth Edition, 1980
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 8731
- A Glossary of Paper Conservation Terms, Margaret Ellis (ed.), Conservation Center of the Institute of Fine Arts, New York City, 1998
- CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index= 1.474, 1.526, 1.685