What is "hydrazinium"

n. (context inorganic chemistry English) The univalent cation N₂H₅⁺ formed by protonation of hydrazine

Hydrazinium is the cation with the formula NH. In some cases, "hydrazine" implies NH, 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. Hydrazinium is a weak acid with pK = 8.1.