Disodium hydrogen phosphite

Disodium hydrogen phosphite
Names
	IUPAC name sodium phosphonate pentahydrate
	Other names Sodium phosphate dibasic pentahydrate,; sodium phosphite
Identifiers
CAS Number	anhydrous: 13708-85-5 ; pentahydrate: 13517-23-2 ;
3D model (JSmol)	Interactive image; anhydrous: Interactive image;
ChemSpider	21106436 ;
ECHA InfoCard	100.033.848
PubChem CID	anhydrous: 16211071; pentahydrate: 22463763;
UNII	anhydrous: X65D416703 ; pentahydrate: UM5UZ43YVE ;
CompTox Dashboard (EPA)	DTXSID20889617 ;
	InChI InChI=1S/2Na.O3P/c;;1-4(2)3/q2+1;-3/p+1 Key: XWGAABYWOLJBFF-UHFFFAOYSA-O ; InChI=1/2Na.O3P/c;;1-4(2)3/q2+1;-3/p+1 Key: XWGAABYWOLJBFF-IKLDFBCSAK;
	SMILES O=P([O-])([O-])[H].[Na+].[Na+]; anhydrous: [H+].[Na+].[Na+].[O-]P([O-])[O-];
Properties
Chemical formula	HNa2O3P
Molar mass	125.958 g·mol−1
Appearance	white solid
	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

Disodium hydrogen phosphite is the name for inorganic compounds with the formula Na₂HPO₃•(H₂O)_x. The commonly encountered salt is the pentahydrate.^[1] A derivative of phosphorous acid (HP(O)(OH)₂), it contains the anion HPO₃²⁻. Its common name suggests that it contains an acidic hydrogen atom, as in sodium hydrogen carbonate. However, this name is misleading as the hydrogen atom is not acidic, being bonded to phosphorus rather than oxygen. The salt has reducing properties. It is white or colorless solid, and is little studied.

References

^ Brodalla, Dieter; Goeters, Christiane; Kniép, Ruediger; Mootz, Dietrich; Wunderlich, Hartmut (1978). "Zur Kenntnis der Hydrate des Na₂PHO₃, Phasenbeziehungen und kristallographische Untersuchungen (Hydrates of sodium phosphite, phase relations and crystallographic studies)". Zeitschrift für Anorganische und Allgemeine Chemie. 439: 265–74. doi:10.1002/zaac.19784390132.

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[1] Brodalla, Dieter; Goeters, Christiane; Kniép, Ruediger; Mootz, Dietrich; Wunderlich, Hartmut (1978). "Zur Kenntnis der Hydrate des Na₂PHO₃, Phasenbeziehungen und kristallographische Untersuchungen (Hydrates of sodium phosphite, phase relations and crystallographic studies)". Zeitschrift für Anorganische und Allgemeine Chemie. 439: 265–74. doi:10.1002/zaac.19784390132.