Name | Hydrazoic acid |
Synonyms | Azoimide Triazoic acid 1H-Triazirine hydrogen azide Hydrazoic acid Hydronitric acid Hydrazoic acid (as vapour) |
CAS | 7782-79-8 |
EINECS | 231-965-8 |
Molecular Formula | HN3 |
Molar Mass | 43.02804 |
Density | 1.092 |
Melting Point | -80° |
Boling Point | bp 37° |
Water Solubility | very soluble H2O [HAW93] |
Appearance | colorless liquid |
Exposure Limit | Ceiling 0.1 ppm vapor (ACGIH). |
pKa | 4.72(at 25℃) |
Stability | Unstable. Violently explosive in the concentrated or pure states. Readily forms explosive compounds with heavy metals. This is a dangerous and hard to handle substance which must not be prepared or ha |
UN IDs | 0473 |
Hazard Class | 1.1A |
Toxicity | LD50 in mice (mg/kg): 21.5 i.p. (Graham) |
EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
introduction | azide acid is also called hydrogen azide, which is colorless and pungent liquid at room temperature. N3-is also called halide-like ion. It can be prepared by reacting acid with sodium azide. |
use | azide acid can be used in organic synthesis, and its lead salt is used as a detonator. |
production method | 1. preparation method NaN 3 + CH 3 (CH 2 ) 16 COOH → HN 3 + CH 3 (CH 2 ) 16 COONa is mixed with pure NaN 3 and stearic acid in a flask and connected with a receiving bottle placed in a cold trap at -40 ℃. Vacuum is drawn and flask water bath is heated, HN 3 is collected in the receiving bottle. Then it is distilled and purified at -50 ℃ to -80 ℃. Note: HN 3 will explode violently, the amount of synthesis each time should be small, and the temperature should not be high. And should be carried out in a fume hood with explosion-proof glass. The aqueous solution of azide acid can be prepared by the following methods. 2. Add 15g NaN 3 and 5g NaOH (in a fume hood) to a 250mL three-neck flask and 150mL of deionized water. Install the drip funnel and distillation unit. Connect a 500mL suction bottle containing deionized water with a tail nozzle at the end of the condenser. 90mL 40% sulfuric acid is put into the dropping funnel. Heat a three-necked flask to boiling, then add the sulfuric acid drop by drop. |
category | explosives |
toxicity classification | highly toxic |
acute toxicity | inhalation-rat LCL0: 1100 PPM/ 1 hour; Abdominal cavity-mouse LD50: 22 mg/kg |
explosive hazard characteristics | high heat, vibration, impact, friction can explode |
flammability hazard characteristics | combustion produces toxic nitrogen oxide smoke |
storage and transportation characteristics | light and light; The warehouse is ventilated, away from open flames, high temperature and sunlight; Store separately from oxidants, flammable materials and food raw materials |
fire extinguishing agent | mist water, foam, carbon dioxide |
occupational standard | TWA 0.27 mg/m3; STEL 0.2 mg/m3 |
toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |