Reactions
In its properties hydrazoic acid shows some analogy to the halogen acids, since it forms poorly soluble (in water) lead, silver and mercury(I) salts. The metallic salts all crystallize in the anhydrous form and decompose on heating, leaving a residue of the pure metal. It is a weak acid (pKa = 4.75.) Its heavy metal salts are explosive and readily interact with the alkyl iodides. Azides of heavier alkali metals (excluding lithium) or alkaline earth metals are not explosive, but decompose in a more controlled way upon heating, releasing spectroscopically-pure N2 gas. Solutions of hydrazoic acid dissolve many metals (e.g. zinc, iron) with liberation of hydrogen and formation of salts, which are called azides, formerly also called azoimides or hydrazoates).
Dissolution in the strongest acids produces explosive salts containing the H2N=N=N+ ion, for example:
- HN=N=N + HSbCl6 → +−
The ion H2N=N=N+ is isoelectronic to diazomethane.
Read more about this topic: Hydrazoic Acid
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