Issue 19, 1995

Is hydrazoic acid (HN3) an intermediate in the destruction of hydrazine by excess nitrous acid?

Abstract

The kinetics of the decomposition of NH2N[double bond, length half m-dash]NOH, the intermediate absorbing at 225 nm formed in the nitrous acid–hydrazine reaction have been studied by stopped-flow spectrophotometry at acidities up to 1 mol dm–3 H+. A substantial amount of protonation occurs at high acidities, and the pKa of NH3+N[double bond, length half m-dash]NOH is 0.57. In excess hydrazine decomposition occurs to form hydrazoic acid (HN3), but in excess nitrous acid a rapid second nitrosation occurs by a diffusion-controlled reaction between NO+ and NH2N[double bond, length half m-dash]NOH which can bypass this pathway, though the possibility of some hydrazoic acid formation cannot be ruled out. Spectrophotometric evidence has been obtained for the formation of a relatively stable species, probably a very minor component, a product of the double-nitrosation reaction.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1995, 3103-3107

Is hydrazoic acid (HN3) an intermediate in the destruction of hydrazine by excess nitrous acid?

A. M. M. Doherty, K. R. Howes, G. Stedman and M. Q. Naji, J. Chem. Soc., Dalton Trans., 1995, 3103 DOI: 10.1039/DT9950003103

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