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Science Quote by Gilbert Newton Lewis

"We frequently define an acid or a base as a substance whose aqueous solution gives, respectively, a higher concentration of hydrogen ion or of hydroxide ion than that furnished by pure water. This is a very one sided definition"

About this Quote

Lewis is doing something rarer than it looks: politely calling out bad intellectual hygiene. The “one sided” jab lands because it’s aimed at a definition that pretends to be fundamental while smuggling in an arbitrary setting - water - as if chemistry’s deepest categories should depend on what happens when you dilute something into a particular solvent. His tone is measured, but the critique is sharp: if your theory can’t survive leaving the beaker, it isn’t a theory so much as a classroom convenience.

The context matters. Early 20th-century chemistry was professionalizing fast, and the Arrhenius view of acids and bases (acid makes H+, base makes OH- in water) had become a dominant teaching tool precisely because it’s easy to operationalize. Lewis, working in an era increasingly shaped by electrons, bonding, and broader thermodynamic thinking, is pushing against that parochialism. The subtext is that definitions should track mechanisms, not lab rituals. If ammonia is “basic” but doesn’t contain hydroxide, or if acid-base behavior changes radically in non-aqueous solvents, the water-only definition starts to look like a map drawn for one city and sold as a globe.

His intent is also rhetorical positioning. By framing the prevailing definition as “frequently” used, he signals both its popularity and its inadequacy, making room for a more general account: acids as electron-pair acceptors, bases as electron-pair donors. The quiet provocation is that scientific categories aren’t sacred; they’re tools. If the tool is one-sided, it’s not the world that’s wrong - it’s the handle.

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APA Style (7th ed.)
Lewis, Gilbert Newton. (2026, January 15). We frequently define an acid or a base as a substance whose aqueous solution gives, respectively, a higher concentration of hydrogen ion or of hydroxide ion than that furnished by pure water. This is a very one sided definition. FixQuotes. https://fixquotes.com/quotes/we-frequently-define-an-acid-or-a-base-as-a-161838/

Chicago Style
Lewis, Gilbert Newton. "We frequently define an acid or a base as a substance whose aqueous solution gives, respectively, a higher concentration of hydrogen ion or of hydroxide ion than that furnished by pure water. This is a very one sided definition." FixQuotes. January 15, 2026. https://fixquotes.com/quotes/we-frequently-define-an-acid-or-a-base-as-a-161838/.

MLA Style (9th ed.)
"We frequently define an acid or a base as a substance whose aqueous solution gives, respectively, a higher concentration of hydrogen ion or of hydroxide ion than that furnished by pure water. This is a very one sided definition." FixQuotes, 15 Jan. 2026, https://fixquotes.com/quotes/we-frequently-define-an-acid-or-a-base-as-a-161838/. Accessed 12 Feb. 2026.

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Lewis critique of the Arrhenius acid-base definition
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Gilbert Newton Lewis (October 23, 1875 - March 23, 1946) was a Scientist from USA.

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