common ion effect chemistry Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/common-ion-effect Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a type (Required) Factual Correction Spelling/Grammar Correction Link Correction Additional Information Other Your Feedback Submit Feedback Thank you for your feedback Our editors will review what you’ve submitted and determine whether to revise the article.

　　External Websites Ask the Chatbot a Question Written by Kara Rogers Kara Rogers is the senior editor of biomedical sciences at Encyclopædia Britannica, where she oversees a range of content from medicine and genetics to microorganisms. She joined Britannica in 2006 and... Kara Rogers Fact-checked by The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors. The Editors of Encyclopaedia Britannica Last Updated: Mar 5, 2025 • Article History Table of Contents Table of Contents Ask the Chatbot { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type" : "Question", "name" : " What is the common ion effect in chemistry? ", "acceptedAnswer" : { "@type" : "Answer", "text" : "The common ion effect is the phenomenon in which the addition of an ion already present in a solution reduces the solubility of a weak electrolyte or suppresses the ionization of a weak acid or base." } } , { "@type" : "Question", "name" : " How does the common ion effect relate to Le Chatelieru2019s principle? ", "acceptedAnswer" : { "@type" : "Answer", "text" : "The common ion effect is a direct application of Le Chatelieru2019s principle, in which adding more of a reactant causes a system to shift to counteract the change, reducing dissociation or ionization." } } , { "@type" : "Question", "name" : " What are some applications of the common ion effect? ", "acceptedAnswer" : { "@type" : "Answer", "text" : "Applications of the common ion effect include selective precipitation in qualitative analysis, maintaining stable pH in buffer systems, controlling solubility and reaction rates in industrial chemistry, and purifying salts." } } ] } Top Questions What is the common ion effect in chemistry? The common ion effect is the phenomenon in which the addition of an ion already present in a solution reduces the solubility of a weak electrolyte or suppresses the ionization of a weak acid or base.

　　How does the common ion effect relate to Le Chatelier’s principle? The common ion effect is a direct application of Le Chatelier’s principle, in which adding more of a reactant causes a system to shift to counteract the change, reducing dissociation or ionization.

　　What are some applications of the common ion effect? Applications of the common ion effect include selective precipitation in qualitative analysis, maintaining stable pH in buffer systems, controlling solubility and reaction rates in industrial chemistry, and purifying salts.

　　common ion effect, in chemistry, phenomenon in which the addition of an ion that is already present in a solution reduces the solubility of a weak electrolyte or suppresses the ionization of a weak acid or base. It is a direct application of Le Chatelier’s principle, an underlying concept of chemical equilibrium, and serves a key role in buffer systems, pH control, and salt precipitation. According to Le Chatelier’s principle, when a system at equilibrium is disturbed by adding more of a reactant, the system will shift to counteract the change. Thus, when added to a solution, a salt or ...(100 of 231 words)

　　Access the full article Help support true facts by becoming a member. Subscribe today!