Sodium azide
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 very acutely poisonous.
| Names | |
|---|---|
| IUPAC name
Sodium azide | |
| Other names
Sodium trinitride Smite Azium | |
| Identifiers | |
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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| Properties | |
| 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 |
| 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 | |
| Hexagonal, hR12 | |
| 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: | |
| Danger | |
| H300, H310, H410 | |
| 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 | |
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