hydrogen ion

noun

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

hydrogen ion

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 ⁺

Word History and Origins

Origin of hydrogen ion¹

First recorded in 1895–1900

Example Sentences

In a solution, an acid is a chemical that will release hydrogen ions — atoms with a tiny positive charge.

From Science News For Students

While most hydrogen bonds in water are weak, strong hydrogen bonds similar to the ones found in the bifluoride ions can form in water that contains excess hydrogen ions.

From Science News

That is, different concentrations of hydrogen-ion or of hydroxide-ion are required to change their colors.

From Project Gutenberg

It is very likely that in aqueous acids, a large proportion, at least, of the hydrogen-ion is similarly combined with water.

From Project Gutenberg

The hydrogen-ion will very decidedly reduce the concentration of the acetate-ion, acetic acid being a weak acid (table, p. 104).

From Project Gutenberg

As a weak acid, acetic acid produces much less hydrogen-ion than is formed in equivalent solutions of sulphuric acid.

From Project Gutenberg

We call each a “hydrogen ion” but you can see that each is a single proton.

From Project Gutenberg