Sodium azide
| Names | |
|---|---|
| IUPAC name
Sodium azide | |
| Other names
Sodium trinitride Smite Azium | |
| Identifiers | |
CAS Number |
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3D model (JSmol) |
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| ChEBI | |
| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.043.487 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
| UN number | 1687 |
CompTox Dashboard (EPA) |
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InChI
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SMILES
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| 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 |
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Signal word |
Danger |
Hazard statements |
H300, H310, H410 |
Precautionary statements |
P260, P280, P301+P310, P501 |
| NFPA 704 (fire diamond) | |
| 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).
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.