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Hydrazinium
Hydrazinium is the cation with the formula N2H5+. In some cases, "hydrazine" implies N2H5+, e.g. the salt hydrazinium sulfate. Hydrazinium is derived from hydrazine by protonation (treatment with a strong acid). Salts of hydrazinium are common reagents in chemistry and are often used in certain industrial processes. Both are water-soluble, colorless salts.〔Jean-Pierre Schirmann, Paul Bourdauducq "Hydrazine" in ''Ullmann's Encyclopedia of Industrial Chemistry'', Wiley-VCH, Weinheim, 2002. .〕 Hydrazinium is a weak acid with pKa = 8.1. ==Hydrazinium azide== One of the most unusual (and more unstable) salts of hydrazinium is the azide. Hydrazine azide (N5H5), the salt of hydrazine and hydrazoic acid, was of scientific interest, because of its high nitrogen content and explosive properties. Structurally, it is . It decomposes explosively into hydrazine, ammonia and nitrogen gas: :12 → 3 + 16 + 19
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