Sodium hypophosphite

Sodium hypophosphite
Names
	IUPAC name Sodium phosphinate
Identifiers
CAS Number	7681-53-0 ; 10039-56-2 (monohydrate) ;
3D model (JSmol)	Interactive image;
ChemSpider	21241942 ;
ECHA InfoCard	100.028.791
PubChem CID	16129646;
RTECS number	SZ5640000 (monohydrate);
UNII	8TU1537O43 ; 4VN69WUP7N (monohydrate) ;
CompTox Dashboard (EPA)	DTXSID30873901 ;
	InChI InChI=1S/Na.H3O2P/c;1-3-2/h;3H2,(H,1,2)/q+1;/p-1 Key: SIGUVTURIMRFDD-UHFFFAOYSA-M ; InChI=1/Na.H3O2P/c;1-3-2/h;3H2,(H,1,2)/q+1;/p-1 Key: SIGUVTURIMRFDD-REWHXWOFAI;
	SMILES [O-][PH2]=O.[Na+];
Properties
Chemical formula	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)
Solubility in water	soluble
Solubility	Ethanol, Acetic acid, Ethylene glycol, Propylene glycol
Hazards
Flash point	Non-flammable
Related compounds
Other anions	Sodium phosphite; Monosodium phosphate; Disodium phosphate; Trisodium phosphate
Other cations	Potassium hypophosphite
Related compounds	Hypophosphorous acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

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