hydrogen ion

American  

noun

1. ionized hydrogen of the form H + , found in aqueous solutions of all acids.

---

hydrogen ion British  

noun

1. an ionized hydrogen atom, occurring in plasmas and in aqueous solutions of acids, in which it is solvated by one or more water molecules; proton. Formula: H ⁺

2. an ionized hydrogen molecule; hydrogen molecular ion. Formula: H 2 ⁺

---

Etymology

Origin of hydrogen ion

First recorded in 1895–1900

Example Sentences

The changes in molecular vibrations of the pMBA molecules, which vary with hydrogen ion adsorption, serve the function of memory and nonlinear waveform transformation for calculation.

From Science Daily • Apr. 26, 2024

In the reaction, a molecule of hydrogen gas collides with one deuterium ion to produce a hydrogen ion and a heavy, deuterium-containing hydrogen molecule.

From Scientific American • Apr. 4, 2023

Polyprotic bases are capable of accepting more than one hydrogen ion.

From Textbooks • Feb. 14, 2019

Consequently, the bonded water molecules' O–H bonds are more polar than in nonbonded water molecules, making the bonded molecules more prone to donation of a hydrogen ion:

From Textbooks • Feb. 14, 2019

The unit charge is that which is dissociated with a hydrogen ion.

From An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes by Talbot, Henry P.