hydrogen ion

noun

Definition of hydrogen ion 

1 : the cation H+ of acids consisting of a hydrogen atom whose electron has been transferred to the anion of the acid

2 : hydronium

Examples of hydrogen ion in a Sentence

Recent Examples on the Web

The more hydrogen ions present, the more acidic the solution will be, and the lower the pH. SELF, "What Even Is Alkaline Water and Is It Really Better Than Regular Water?," 6 Sep. 2018 The sun and all other stars generate light by nuclear fusion, smashing hydrogen ions together to form helium, a process that releases energy. Tim Folger, Discover Magazine, "How Quantum Mechanics Lets Us See, Smell and Touch," 24 Oct. 2018 For starters, let’s talk about pH. A substance’s pH (potential hydrogen) is the measure of the hydrogen ion concentration within it. SELF, "What Even Is Alkaline Water and Is It Really Better Than Regular Water?," 6 Sep. 2018 The enormous clouds emit large amounts of ultraviolet light with a spectral line produced by hydrogen ions, known as a Lyman-alpha line. Jay Bennett, Popular Mechanics, "Giant Glowing Space Blob's Power Source Discovered," 21 Sep. 2016 At the cathode, catalysts split N2 molecules and prompt the hydrogen ions and electrons to react with nitrogen and make ammonia. Robert F. Service, Science | AAAS, "Ammonia—a renewable fuel made from sun, air, and water—could power the globe without carbon," 12 July 2018 The anode, covered with a catalyst, splits water molecules into O2, hydrogen ions, and electrons. Robert F. Service, Science | AAAS, "Ammonia—a renewable fuel made from sun, air, and water—could power the globe without carbon," 12 July 2018 Further testing showed that the feet contained a molecular pump that moves around hydrogen ions, or protons, to make acid. Veronique Greenwood, New York Times, "This Burrowing Clam Is Not Boring. It Uses Acid to Make Its Home.," 14 June 2018 The radio waves are calibrated to target just the less abundant material, in this case hydrogen ions. Jay Bennett, Popular Mechanics, "MIT Achieves Breakthrough in Nuclear Fusion," 28 Aug. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hydrogen ion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of hydrogen ion

1896, in the meaning defined at sense 1

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Last Updated

12 Dec 2018

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The first known use of hydrogen ion was in 1896

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More Definitions for hydrogen ion

hydrogen ion

noun

Medical Definition of hydrogen ion 

1 : the cation H+ of acids consisting of a hydrogen atom whose electron has been transferred to the anion of the acid

2 : hydronium

More from Merriam-Webster on hydrogen ion

Britannica.com: Encyclopedia article about hydrogen ion

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