Hydrazoic Acid
Title: Hydrazoic Acid
CAS Registry Number: 7782-79-8
Additional Names: Hydrogen azide; hydronitric acid; triazoic acid; stickstoffwasserstoffsäure (German)
Molecular Formula: HN3
Molecular Weight: 43.03
Percent Composition: H 2.34%, N 97.65%
Literature References: Produced by the action of sulfuric acid on sodium azide: L. F. Audrieth, C. F. Gibbs, Inorg. Synth. 1, 77 (1939); using stearic acid: Günther, Meyer, Z. Elektrochem. 41, 541 (1935). Prepn of water and ether solns of hydrazoic acid: W. S. Frost et al., J. Am. Chem. Soc. 55, 3516 (1933); L. F. Audrieth, C. F. Gibbs, loc. cit.; P. W. Schenk in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) pp 472-474. GC determn: J. M. Zehner, R.A. Simonaitis, J. Chromatogr. Sci. 14, 493 (1976). Toxicity study: Graham et al., J. Ind. Hyg. Toxicol. 30, 98 (1948). Review of toxicology: C. F. Reinhardt, M. R. Brittelli, in Patty's Industrial Hygiene and Toxicology Vol. 2A, G. D. Clayton, F. E. Clayton, Eds. (Wiley-Interscience, New York, 1981) pp 2779-2784. Reviews: Mason in Mellor's vol. VIII, suppl. II, Nitrogen (part II), 1-15 (1967); Jones in Comprehensive Inorganic Chemistry vol. 2, J. C. Bailar Jr. et al., Eds. (Pergamon Press, Oxford, 1973) pp 276-293.
Properties: Mobile liquid. Intolerable pungent odor. Extremely explosive! mp -80°. bp 37°. pKa 4.72. LD50 in mice (mg/kg): 21.5 i.p. (Graham).
Melting point: mp -80°
Boiling point: bp 37°
pKa: pKa 4.72
Toxicity data: LD50 in mice (mg/kg): 21.5 i.p. (Graham)
CAUTION: Acute exposure: eye irritation, cough, headache, fall in blood pressure, weakness, collapse. Chronic exposure: hypotension, weakness, palpitation, ataxia (Graham).
Use: Industrially in prepn of heavy metal azides for shell detonators.

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