Chemical Knowledge Share – Hydrogen azoic acid

Thread Content

Chemical formula HN3. It is a covalent molecule; its molecular structure features 3 nitrogen atoms aligned in a straight line, though at slightly different distances from each other. Colorless liquid, melting point -80°C, boiling point 35.7°C. Decomposes upon impact, with a violent explosion: 2HN3 = 3N2 + H2. Its aqueous solution is a stable monoprotic weak acid (K=1.9×10-5). It reacts with metals to form azides: 6HN3 + 4Li = 4LiN3 + 2N2H3 + 2N2. Azides of reactive metals such as alkali metals and barium do not explode when heated, but decompose into nitrogen and metal. Covalent azides of Ag, Cu, Pb, Hg, etc., explode when heated, and lead azide is widely used as an initiator for * tubes. Azidic acid is both a strong oxidizing agent and a strong reducing agent. Azotic acid can be obtained by reacting dilute sulfuric acid with sodium azide.