Potassium metabisulfite
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Description
White granules or powder with a pungent odor. Potassium metabisulfite is used as a Bleaching agent for Straw, Wood, textiles, and Paper. It is also used in photographic developing solutions.
Synonyms and Related Terms
potassium pyrosulfite; dipotassium disulfite
Other Properties
Soluble in water. Insoluble in ethanol. Oxidized in air to form potassium sulfate.
| Composition | K2S2O5 |
|---|---|
| CAS | 16731-55-8 |
| Melting Point | 150-190 (dec) |
| Density | 2.3 |
| Molecular Weight | mol. wt. = 222.3 |
Hazards and Safety
International Chemical Safety Card
Sources Checked for Data in Record
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
- Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
- The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 7811