Sodium aluminate

Sodium aluminate
	; Crystal structure with sodium in yellow, aluminium in grey, and oxygen in red
	; Sodium metaaluminate sample
Names
	IUPAC name Sodium aluminate
	Other names Sodium aluminium oxide,; Sodium metaaluminate; Aluminate, ((AlO2)1−), sodium
Identifiers
CAS Number	1302-42-7 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.013.728
EC Number	215-100-1;
PubChem CID	14766;
UNII	2VMT26903W ;
CompTox Dashboard (EPA)	DTXSID90872314 DTXSID3051206, DTXSID90872314 ;
	InChI InChI=1S/Al.Na.2O/q-1;+1;; Key: IYJYQHRNMMNLRH-UHFFFAOYSA-N;
	SMILES O=[Al-]=O.[Na+];
Properties
Chemical formula	NaAlO2
Molar mass	81.97 g/mol
Appearance	white powder (sometimes light-yellowish) ; hygroscopic/ when dissolved in water a colloidal black solution is formed
Odor	odorless
Density	1.5 g/cm3
Melting point	1,650 °C (3,000 °F; 1,920 K)
Solubility in water	highly soluble
Solubility	Insoluble in alcohol
Refractive index (nD)	1.566
Structure
Crystal structure	orthorhombic
Thermochemistry
Heat capacity (C)	73.6 J/mol K
Std molar; entropy (S⦵298)	70.4 J/mol K
Std enthalpy of; formation (ΔfH⦵298)	-1133.2 kJ/mol
	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 aluminate is an inorganic chemical that is used as an effective source of aluminium hydroxide for many industrial and technical applications. Pure sodium aluminate (anhydrous) is a white crystalline solid having a formula variously given as NaAlO₂, NaAl(OH)₄ (hydrated), Na₂O·Al₂O₃, or Na₂Al₂O₄. Commercial sodium aluminate is available as a solution or a solid.
Other related compounds, sometimes called sodium aluminate, prepared by reaction of Na₂O and Al₂O₃ are Na₅AlO₄ which contains discrete AlO₄⁵⁻ anions, Na₇Al₃O₈ and Na₁₇Al₅O₁₆ which contain complex polymeric anions, and NaAl₁₁O₁₇, once mistakenly believed to be β-alumina, a phase of aluminium oxide.

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