Hydronium

Hydronium is the H₃O⁺ ion formed when a water molecule accepts a proton. It is the principal carrier of positive charge in aqueous acids.

Brønsted–Lowry acid–base theory: A theory defining acids as proton donors and bases as proton acceptors. Water acts as a base when it accepts a proton to form hydronium.
Water: The compound H₂O, whose molecules consist of two hydrogen atoms bonded to one oxygen atom. Water accepts the proton that creates hydronium.
Acid–base reaction: A chemical reaction involving proton transfer between an acid and a base. Hydronium commonly donates a proton in aqueous acid–base reactions.
Hydrogen ion: A positively charged hydrogen species, commonly written H⁺, whose behavior depends on its chemical environment. In water, a bare proton is not a stable description of the solvated positive charge.
Proton solvation: The stabilization of an excess proton by interactions with surrounding solvent molecules. Hydronium’s effective structure depends on how water molecules solvate the excess proton.
Proton transfer: The movement of a proton from one chemical species to another. A water molecule becomes hydronium by accepting a proton.
Proton: A positively charged subatomic particle found in atomic nuclei; in chemistry, the term often means H⁺. Hydronium forms when water accepts a proton.
Acid dissociation constant: An equilibrium constant measuring the extent to which an acid transfers protons to water. Its definition tracks hydronium produced as an acid ionizes in water.
Hydroxide: The negatively charged polyatomic ion OH⁻, formed when water loses a proton. Hydroxide is the negatively charged counterpart in water’s proton-transfer chemistry.
Ab initio molecular dynamics: A simulation method that calculates atomic motion using forces derived from electronic-structure calculations. It helps model proton transfer without fixing hydronium’s structure in advance.

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