Sodium hypophosphite
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IUPAC name
Sodium phosphinate
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Identifiers | |
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3D model (
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ChemSpider | |
ECHA InfoCard
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100.028.791 |
PubChem CID
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RTECS number
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CompTox Dashboard (EPA)
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Properties | |
NaPO2H2 | |
Molar mass | 87.98 g/mol (anhydrous) 105.99 g/mol (monohydrate) |
Appearance | white solid |
Density | 0.8 g/cm3 (monohydrate) |
Melting point | 310 °C (590 °F; 583 K) (monohydrate) |
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Solubility | Ethanol, Acetic acid, Ethylene glycol, Propylene glycol[1] |
Hazards | |
Flash point | Non-flammable |
Related compounds | |
Other anions
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Other cations
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Potassium hypophosphite |
Related compounds
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Hypophosphorous acid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium hypophosphite (NaPO2H2, also known as sodium phosphinate) is the sodium salt of hypophosphorous acid and is often encountered as the monohydrate, NaPO2H2·H2O. It is a solid at room temperature, appearing as odorless white crystals. It is soluble in water, and easily absorbs moisture from the air.
Sodium hypophosphite should be kept in a cool, dry place, isolated from oxidizing materials. It decomposes into phosphine which is irritating to the respiratory tract and disodium phosphate.
- 2 NaH2PO2 → PH3 + Na2HPO4
Uses
Like other
Sodium hypophosphite is capable of reducing nickel ions in solution to metallic nickel on metal substrates as well as on plastic substrates.[3] The latter requires that the substrate is activated with fine particles of palladium. The resulting nickel deposit contains up to 15% phosphorus.
It has been investigated as a food additive.
DEA List I status
The United States Drug Enforcement Administration designated sodium hypophosphite as a List I chemical under 21 CFR 1310.02 effective November 17, 2001, specifically mentioning the compound together with several other salts of hypophosphorous acid.[4][5]
References
- PMID 26083977.
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- ^ D. Rich & M. Smith, Electroless Deposition of Nickel, Cobalt and Iron, IBM Corp (1971)
- ^ 66 FR 52670—52675. 17 October 2001.
- ^ 37 CFR 1310.02