Hydronium

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Properties Simple | Detailed

Formula H3O
IUPAC Name oxygen(+1) monohydride cation
Molecular Mass 19.023 g·mol−1
Heat of Formation -69.5 ± 16.7 kJ·mol−1
Dipole Moment 0.75 ± 1.08 D
Volume 28.85 Å 3
Surface Area 47.51 Å 2
Point Group Symmetry C3v
Synonyms
  • [oh3](+)
  • [oh](+)
  • aquahydrogen(1+)
  • h(3)0+
  • h3o(+)
  • h3o+
  • ho(+)
  • hydridooxygen(1+)
  • hydronium cation
  • hydronium ion
  • hydronium, ion
  • hydroxyl cation
  • hydroxylium
  • oxidanium
  • oxidanylium
  • oxonium
  • oxoniumyl
  • trihydridooxygen(1+)
  • water ion
CAS Number(s)
  • 12259-29-9
  • 56583-62-1
  • 13968-08-6
InChIKey XLYOFNOQVPJJNP-UHFFFAOYSA-O
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Elements H O