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 an ionic substance, is highly soluble in water, and is acutely poisonous.^[5]

^ ^a ^b Stevens E. D.; Hope H. (1977). "A Study of the Electron-Density Distribution in Sodium Azide, NaN
₃". Acta Crystallographica A. 33 (5): 723–729. doi:10.1107/S0567739477001855.
^ "Sodium azide".
^ ^a ^b ^c NIOSH Pocket Guide to Chemical Hazards. "#0560". National Institute for Occupational Safety and Health (NIOSH).
^ "Material Safety Data Sheet" (PDF). Sciencelab.com. November 6, 2008. Archived from the original (PDF) on March 4, 2016. Retrieved October 26, 2015.
^ Cite error: The named reference Ull was invoked but never defined (see the help page).

[stevens-1] Stevens E. D.; Hope H. (1977). "A Study of the Electron-Density Distribution in Sodium Azide, NaN
₃". Acta Crystallographica A. 33 (5): 723–729. doi:10.1107/S0567739477001855.

[2] "Sodium azide".

[PGCH-3] NIOSH Pocket Guide to Chemical Hazards. "#0560". National Institute for Occupational Safety and Health (NIOSH).

[4] "Material Safety Data Sheet" (PDF). Sciencelab.com. November 6, 2008. Archived from the original (PDF) on March 4, 2016. Retrieved October 26, 2015.

[Ull-5] Cite error: The named reference Ull was invoked but never defined (see the help page).

[1]

[2]

[3]

[5]

Names



IUPAC name Sodium azide
Other names Sodium trinitride Smite Azium
Identifiers
CAS Number	26628-22-8^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:278547^Y
ChEMBL	ChEMBL89295^Y
ChemSpider	30958^Y
ECHA InfoCard	100.043.487
EC Number	247-852-1
PubChem CID	33557
RTECS number	VY8050000
UNII	968JJ8C9DV^Y
UN number	1687
CompTox Dashboard (EPA)	DTXSID8020121
InChI InChI=1S/N3.Na/c1-3-2;/q-1;+1^Y Key: PXIPVTKHYLBLMZ-UHFFFAOYSA-N^Y 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 (pK_a)	4.8
Structure
Crystal structure	Hexagonal, hR12^[1]
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 (Δ_fH^⦵₂₉₈)	21.3 kJ/mol
Gibbs free energy (Δ_fG^⦵)	99.4 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H310, H410
Precautionary statements	P260, P280, P301+P310, P501 ^[2]
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)^[1]
NIOSH (US health exposure limits):
PEL (Permissible)	None^[3]
REL (Recommended)	C 0.1 ppm (as HN₃) [skin] C 0.3 mg/m³ (as NaN₃) [skin]^[3]
IDLH (Immediate danger)	N.D.^[3]
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). N verify (what is ^YN ?) Infobox references