Arrhenius Base Definition

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An Arrhenius base is a substance that when added to water increases the number of OH- ions in the water. The base dissociates in water to form hydroxide (OH-) ions. It may decrease the aqueous hydronium ion (H3O+) concentration.
Arrhenius bases follow the reaction:
base + H2O → conjugate acid + OH-


  • Paik, Seoung-Hey (2015). "Understanding the Relationship Among Arrhenius, Brønsted–Lowry, and Lewis Theories." Journal of Chemical Education. 92 (9): 1484–1489. doi:10.1021/ed500891w
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Helmenstine, Anne Marie, Ph.D. "Arrhenius Base Definition." ThoughtCo, Aug. 28, 2020, Helmenstine, Anne Marie, Ph.D. (2020, August 28). Arrhenius Base Definition. Retrieved from Helmenstine, Anne Marie, Ph.D. "Arrhenius Base Definition." ThoughtCo. (accessed November 26, 2022).