Hydrogen ion


Hydrogen ion

Hydrogen ion is recommended by IUPAC as a general term for all ions of hydrogen and its isotopes. ["Compendium of Chemical Terminology", 2nd edition McNaught, A.D. and Wilkinson, A. Blackwell Science, 1997 [ISBN 0-86542-684-8] , also [http://www.iupac.org/publications/compendium/index.html online] ] Depending on the charge of the ion, two different classes can be distinguished:

Cation (positively charged)

When hydrogen loses its electron, the following cations can be formed:

* Hydron: general name referring to the positive ion of any hydrogen isotope (H+)
* Proton: 1H+
* Deuteron: 2H+, D+
* Triton: 3H+, T+In addition, the ions produced by the reaction of these cations with water as well as their hydrates are called hydrogen ions:

* Hydronium ion: H3O+
* Zundel cation: H5O2+
* Eigen cation: H9O4+

The latter two play an important role in proton hopping according to the Grotthuss mechanism.

In connection with acids, hydrogen ions typically refer to hydrons.

Anion (negatively charged)

Hydrogen anions are formed when additional electrons are acquired:

* Hydride: general name referring to the negative ion of any hydrogen isotope
* Deuteride: 2H-, D-
* Tritide: 3H-, T-

In organic chemistry, a hydrogen atom in a molecule is often referred to simply as a proton. The hydrogen anion has played an important role in quantum physics.

ee also

* Acid
* pH

References


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Look at other dictionaries:

  • Hydrogen ion — Hydrogen er et grundstof. Et hydrogen atom angives tit bare med et H. Hvis hydrogen atomet mangler en elektron, vil det gerne reagere med andre grundstoffer og molekyler. Når det sker kaldes hydrogen i stedet for en hydrogen ion. En hydrogen ion… …   Danske encyklopædi

  • hydrogen ion — or hydrogen n. 1. the positively charged nucleus of hydrogen, H+, without its electron 2. HYDRONIUM ION …   English World dictionary

  • hydrogen ion — n 1) the cation H+ of acids consisting of a hydrogen atom whose electron has been transferred to the anion of the acid 2) HYDRONIUM * * * the nucleus of the hydrogen atom or a hydrogen atom that has lost its electron, H+; it bears a positive… …   Medical dictionary

  • hydrogen ion — ionized hydrogen of the form H+, found in aqueous solutions of all acids. [1895 1900] * * * ▪ chemistry       strictly, the nucleus of a hydrogen atom separated from its accompanying electron. The hydrogen nucleus is made up of a particle… …   Universalium

  • hydrogen ion — noun a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus • Hypernyms: ↑proton, ↑cation • Part Holonyms: ↑hydrogen atom * * * noun 1. : the cation H+ of acids consisting of a hydrogen atom wh …   Useful english dictionary

  • hydrogen ion — noun Date: 1896 1. the cation H+ of acids consisting of a hydrogen atom whose electron has been transferred to the anion of the acid 2. hydronium …   New Collegiate Dictionary

  • hydrogen ion — hy′drogen i′on n. chem. ionized hydrogen of the form H+, found in aqueous solutions of all acids • Etymology: 1895–1900 …   From formal English to slang

  • hydrogen ion — noun a) ; H or H b) a proton combined with one or more water molecules; usually written HO and called the hydronium ion though is best considered as HO but is often written H for simplicity …   Wiktionary

  • hydrogen ion — /ˈhaɪdrədʒən aɪən/ (say huydruhjuhn uyuhn) noun a proton, H+, existing as a hydronium ion, H3O+ in aqueous solution …   Australian English dictionary

  • hydrogen ion concentration — hydrogen ion concentration. См. водородный показатель. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.


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