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NH4+

Names IUPAC nameAmmonium ionSystematic IUPAC nameAzaniumIdentifiers CAS Number14798-03-93D model (JSmol)Interactive imageChEBICHEBI:28938ChemSpider218Gmelin Reference84 KEGGC01342MeSHD000644PubChemCID16741146UNII54S68520I4CompTox Dashboard(EPA)DTXSID5043974InChIInChI=1S/H3N/h1H3/p+1Key: QGZKDVFQNNGYKY-UHFFFAOYSA-OInChI=1/H3N/h1H3/p+1Key: QGZKDVFQNNGYKY-IKLDFBCSAZSMILES[NH4+]Properties Chemical formula[NH4]Molar mass18.039 g·mol Acidity (pKa) 9.25 Conjugate baseAmmoniaStructure Molecular shapeTetrahedralRelated compounds Other cationsPhosphonium[PH4]Hydronium[H3O]Related compoundsAmmonium 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.

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