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Topic summary

Ammonium

Ammonium
Names IUPAC name
Ammonium ion
Systematic IUPAC name
Azanium
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
84 KEGG
MeSHD000644
UNII
  • InChI=1S/H3N/h1H3/p+1
    Key: QGZKDVFQNNGYKY-UHFFFAOYSA-O
  • InChI=1/H3N/h1H3/p+1
    Key: QGZKDVFQNNGYKY-IKLDFBCSAZ
  • [NH4+]
Properties [NH4]Molar mass18.039 g·mol Acidity (pKa) 9.25 Conjugate baseAmmoniaStructure TetrahedralRelated compounds
Other cations
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).

Ammonium is a modified form of ammonia that has an extra hydrogen atom. It is a positively charged (cationic) molecular ion with the chemical formulaNH+4 or [NH4]. It is formed by the addition of a proton (a hydrogen nucleus) to ammonia (NH3). Ammonium is also a general name for positively charged (protonated) substituted amines and quaternary ammonium cations ([NR4]), where one or more hydrogenatoms 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. As such, human impact in recent years could have an effect on the biological communities that depend on it.

Wikipedia source