Phosphorus acid
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Description
White hygroscopic crystals that is usually marketed as a 20% aqueous solution. Phosphorus acid is a good reducing agent and a stronger acid than phosphoric acid. Phosphorous acid is primarily used as a reagent and to make phosphate salts.
Synonyms and Related Terms
orthophosphorous acid; phosphonic acid; phosphorous phlogisticated
Risks
- Corrosive on contact. Causes burns.
- Fisher Scientific: MSDS
Physical and Chemical Properties
Soluble in water, ethanol.
| Composition | H3PO3 |
|---|---|
| CAS | 13598-36-2 |
| Melting Point | 73 C |
| Density | 1.65 g/ml |
| Molecular Weight | mol. wt. = 82.0 |
| Boiling Point | 200 C (dec) |
Resources and Citations
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7502
- Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985