What is ammonium?

  • (noun): The ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion.
    Synonyms: ammonium ion


The ammonium (more obscurely: aminium) cation is a positively charged polyatomic cation with the chemical formula NH4+. It is formed by the protonation of ammonia (NH3). Ammonium is also a general name for positively charged or protonated substituted amines and quaternary ammonium cations (NR4+), where one or more hydrogen atoms are replaced by organic radical groups (indicated by R).

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Some articles on ammonium:

Sodium Cobaltinitrite
... It is used as a qualitative test for potassium and ammonium ions (provided that certain other cations are absent) ... Although the sodium salt is soluble in water, those of potassium and ammonium are insoluble ... The potassium and ammonium salts are precipitated as yellow solids ...
Ammonium Permanganate
... Ammonium permanganate is the chemical compound NH4MnO4, or NH3·HMnO4 ... of oxidizer permanganate anion and reducing ammonium cation ... Dry ammonium permanganate can detonate by heat, shock, or friction, and it may explode at temperatures above 140 °F (60 °C) ...
Ammonium Metal
... The ammonium ion has very similar properties to the heavier alkali metals and is often considered a close relative ... Ammonium is expected to behave as a metal (NH+ 4 ions in a sea of electrons) at very high pressures, such as inside gas giant planets such as Uranus and ...
Salmiakki (book) - History
... The words salmiak and salmiakki are derived from an archaic Latin name for ammonium chloride, sal ammoniacus, meaning "salt of Ammon" ... "Ammon" in turn refers to the temple of Ammon at Siwa Oasis, where ancient Greeks found ammonium chloride ... Ammonium chloride has a history of being used as a cough medicine as it works as an expectorant ...
Ammonium Molybdate
... Ammonium molybdate can refer to Ammonium orthomolybdate, (NH4)2MoO4 Ammonium heptamolybdate, (NH4)6Mo7O24, usually encountered as the tetrahydrate ...