Ammonium
Chemical compound / From Wikipedia, the free encyclopedia
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This article is about the ammonium ion. For its neutral conjugate base, see ammonia.
This article is about the molecular ion. For the ancient city, see Siwa Oasis.
The ammonium cation is a positively charged polyatomic ion with the chemical formula NH+4 or [NH4]+. It is formed by the protonation of ammonia (NH3). Ammonium is also a general name for positively charged (protonated) substituted amines and quaternary ammonium cations ([NR4]+), where one or more hydrogen atoms are replaced by organic or other groups (indicated by R). Not only is ammonium a source of nitrogen and a key metabolite for many living organisms, but it is an integral part of the global nitrogen cycle.[2] As such, the human impact in recent years could have an effect on the biological communities that depend on it.
Quick Facts Names, Identifiers ...
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Names | |||
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IUPAC name
Ammonium ion | |||
Systematic IUPAC name
Azanium[1] | |||
Identifiers | |||
3D model (JSmol) |
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ChEBI | |||
ChemSpider | |||
MeSH | D000644 | ||
PubChem CID |
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UNII | |||
CompTox Dashboard (EPA) |
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Properties | |||
[NH4]+ | |||
Molar mass | 18.039 g·mol−1 | ||
Acidity (pKa) | 9.25 | ||
Conjugate base | Ammonia | ||
Structure | |||
Tetrahedral | |||
Related compounds | |||
Other cations |
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Related compounds |
Ammonium radical •NH4 | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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