Sodium azide

Sodium azide
Names
	IUPAC name Sodium azide
	Other names Sodium trinitride; Smite; Azium
Identifiers
CAS Number	26628-22-8 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:278547 ;
ChEMBL	ChEMBL89295 ;
ChemSpider	30958 ;
ECHA InfoCard	100.043.487
EC Number	247-852-1;
PubChem CID	33557;
RTECS number	VY8050000;
UNII	968JJ8C9DV ;
UN number	1687
CompTox Dashboard (EPA)	DTXSID8020121 ;
	InChI InChI=1S/N3.Na/c1-3-2;/q-1;+1 Key: PXIPVTKHYLBLMZ-UHFFFAOYSA-N ; InChI=1/N3.Na/c1-3-2;/q-1;+1 Key: PXIPVTKHYLBLMZ-UHFFFAOYAH;
	SMILES [N-]=[N+]=[N-].[Na+];
Properties
Chemical formula	NaN3
Molar mass	65.0099 g/mol
Appearance	Colorless to white solid
Odor	Odorless
Density	1.846 g/cm3 (20 °C)
Melting point	275 °C (527 °F; 548 K) violent decomposition
Solubility in water	38.9 g/100 mL (0 °C) ; 40.8 g/100 mL (20 °C) ; 55.3 g/100 mL (100 °C)
Solubility	Very soluble in ammonia ; Slightly soluble in benzene ; Insoluble in diethyl ether, acetone, hexane, chloroform
Solubility in methanol	2.48 g/100 mL (25 °C)
Solubility in ethanol	0.22 g/100 mL (0 °C)
Acidity (pKa)	4.8
Structure
Crystal structure	Hexagonal, hR12
Space group	R-3m, No. 166
Thermochemistry
Heat capacity (C)	76.6 J/mol·K
Std molar; entropy (S⦵298)	70.5 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	21.3 kJ/mol
Gibbs free energy (ΔfG⦵)	99.4 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H310, H410
Precautionary statements	P260, P280, P301+P310, P501
NFPA 704 (fire diamond)	4 1 3
Flash point	300 °C (572 °F; 573 K)
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	27 mg/kg (oral, rats/mice)
	NIOSH (US health exposure limits):
PEL (Permissible)	None
REL (Recommended)	C 0.1 ppm (as HN3) [skin] ; C 0.3 mg/m3 (as NaN3) [skin]
IDLH (Immediate danger)	N.D.
Safety data sheet (SDS)	ICSC 0950
Related compounds
Other anions	Sodium cyanide
Other cations	Potassium azide; Ammonium azide
	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 azide is an inorganic compound with the formula NaN₃. This colorless salt is the gas-forming component in some car airbag systems. It is used for the preparation of other azide compounds. It is highly soluble in water and is acutely poisonous.