# hydronium
## English
### Etymology

From hydro- +‎ onium.

### Noun

hydronium (plural hydroniums)
* (inorganic chemistry, physical chemistry) The hydrated hydrogen ion, H$_3$O$^+$.
** 1996, Richard I. Masel, Principles of Adsorption and Reaction on Solid Surfaces, Wiley, page 148:The case of hydronium ions (H$_3$O$^+$) is an example of this. In the gase phase, hydronium is a weak acid. The data in Table 3.10 indicates that bare hydronium ions have a higher electron affinity than most metal surfaces, so a bare hydronium ion should be neutralized when it absorbs on a bare metal surface. However, a hydrated hydronium ion is a stronger acid.
** 2006, Johanna Holm, Forgotten Chemistry: A Refresher Course, Barron's Educational Series, page 160:Acids are compounds that produce hydronium ions when mixed with water. […] The hydronium ion is a very special ion because it is the defining particle of all acids.
** 2016, Philippe Deprez, Textbook of Chemical Peels: Superficial, Medium, and Deep Peels in Cosmetic Practice, 2nd edition, Taylor & Francis (CRC Press), page 48:Hydronium is not a way of stabilizing an acid, because the structure itself is so quickly transient that it can be considered as not existing.
** 2016, Andrés G. Muñoz, Photoelectrochemical Solar Conversion Systems: Molecular and Electronic Aspects‎, Taylor & Francis (CRC Press), page 206:There is experimental evidence for the formation of coordination groups of hydroniums with several water molecules by hydrogen bridges.

#### Usage notes

* May also be defined as the simplest of a class of oxygen cations with three bonds (i.e., the simplest form of oxonium).

#### Synonyms

* (hydrated hydrogen ion): hydronium ion

#### Hypernyms

* (cation of oxygen): oxonium

#### Coordinate terms

* hydroxide
* hydrogen ion

#### Translations
### Further reading

* Self-ionization of water on Wikipedia.Wikipedia

## Finnish
### Etymology

Internationalism (see English hydronium)

### Pronunciation

* IPA: /ˈhydroˌni.um/, [ˈhydro̞ˌni.um]
* Rhymes: -i.um
* Hyphenation: hydro‧nium

### Noun

hydronium
* (chemistry) hydronium
    Synonym: hydroksonium

#### Declension

Possessive forms of hydronium (Kotus type 5/risti, no gradation) :
first-person singular possessor
singular
plural
nominative
hydroniumini
hydroniumini
accusative
nom.
hydroniumini
hydroniumini
gen.
hydroniumini
genitive
hydroniumini
hydroniumieni
partitive
hydroniumiani
hydroniumejani
inessive
hydroniumissani
hydroniumeissani
elative
hydroniumistani
hydroniumeistani
illative
hydroniumiini
hydroniumeihini
adessive
hydroniumillani
hydroniumeillani
ablative
hydroniumiltani
hydroniumeiltani
allative
hydroniumilleni
hydroniumeilleni
essive
hydroniuminani
hydroniumeinani
translative
hydroniumikseni
hydroniumeikseni
abessive
hydroniumittani
hydroniumeittani
instructive
comitative
—hydroniumeineni
second-person singular possessor
singular
plural
nominative
hydroniumisi
hydroniumisi
accusative
nom.
hydroniumisi
hydroniumisi
gen.
hydroniumisi
genitive
hydroniumisi
hydroniumiesi
partitive
hydroniumiasi
hydroniumejasi
inessive
hydroniumissasi
hydroniumeissasi
elative
hydroniumistasi
hydroniumeistasi
illative
hydroniumiisi
hydroniumeihisi
adessive
hydroniumillasi
hydroniumeillasi
ablative
hydroniumiltasi
hydroniumeiltasi
allative
hydroniumillesi
hydroniumeillesi
essive
hydroniuminasi
hydroniumeinasi
translative
hydroniumiksesi
hydroniumeiksesi
abessive
hydroniumittasi
hydroniumeittasi
instructive
comitative
—hydroniumeinesi
first-person plural possessor
singular
plural
nominative
hydroniumimme
hydroniumimme
accusative
nom.
hydroniumimme
hydroniumimme
gen.
hydroniumimme
genitive
hydroniumimme
hydroniumiemme
partitive
hydroniumiamme
hydroniumejamme
inessive
hydroniumissamme
hydroniumeissamme
elative
hydroniumistamme
hydroniumeistamme
illative
hydroniumiimme
hydroniumeihimme
adessive
hydroniumillamme
hydroniumeillamme
ablative
hydroniumiltamme
hydroniumeiltamme
allative
hydroniumillemme
hydroniumeillemme
essive
hydroniuminamme
hydroniumeinamme
translative
hydroniumiksemme
hydroniumeiksemme
abessive
hydroniumittamme
hydroniumeittamme
instructive
comitative
—hydroniumeinemme
second-person plural possessor
singular
plural
nominative
hydroniuminne
hydroniuminne
accusative
nom.
hydroniuminne
hydroniuminne
gen.
hydroniuminne
genitive
hydroniuminne
hydroniumienne
partitive
hydroniumianne
hydroniumejanne
inessive
hydroniumissanne
hydroniumeissanne
elative
hydroniumistanne
hydroniumeistanne
illative
hydroniumiinne
hydroniumeihinne
adessive
hydroniumillanne
hydroniumeillanne
ablative
hydroniumiltanne
hydroniumeiltanne
allative
hydroniumillenne
hydroniumeillenne
essive
hydroniuminanne
hydroniumeinanne
translative
hydroniumiksenne
hydroniumeiksenne
abessive
hydroniumittanne
hydroniumeittanne
instructive
comitative
—hydroniumeinenne
third-person possessor
singular
plural
nominative
hydroniuminsa
hydroniuminsa
accusative
nom.
hydroniuminsa
hydroniuminsa
gen.
hydroniuminsa
genitive
hydroniuminsa
hydroniumiensa
partitive
hydroniumiaan hydroniumiansa
hydroniumejaan hydroniumejansa
inessive
hydroniumissaan hydroniumissansa
hydroniumeissaan hydroniumeissansa
elative
hydroniumistaan hydroniumistansa
hydroniumeistaan hydroniumeistansa
illative
hydroniumiinsa
hydroniumeihinsa
adessive
hydroniumillaan hydroniumillansa
hydroniumeillaan hydroniumeillansa
ablative
hydroniumiltaan hydroniumiltansa
hydroniumeiltaan hydroniumeiltansa
allative
hydroniumilleen hydroniumillensa
hydroniumeilleen hydroniumeillensa
essive
hydroniuminaan hydroniuminansa
hydroniumeinaan hydroniumeinansa
translative
hydroniumikseen hydroniumiksensa
hydroniumeikseen hydroniumeiksensa
abessive
hydroniumittaan hydroniumittansa
hydroniumeittaan hydroniumeittansa
instructive
comitative
—hydroniumeineen hydroniumeinensa :

#### Derived terms

* hydroniumioni