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ERIC Number: EJ829111
Record Type: Journal
Publication Date: 2008-Aug
Pages: 3
Abstractor: As Provided
ISSN: ISSN-0021-9584
Does the Addition of Inert Gases at Constant Volume and Temperature Affect Chemical Equilibrium?
Paiva, Joao C. M.; Goncalves, Jorge; Fonseca, Susana
Journal of Chemical Education, v85 n8 p1133-1135 Aug 2008
In this article we examine three approaches, leading to different conclusions, for answering the question "Does the addition of inert gases at constant volume and temperature modify the state of equilibrium?" In the first approach, the answer is yes as a result of a common students' alternative conception; the second approach, valid only for ideal mixtures of gases, leads to a negative response, and in the third approach the answer is "a little" obtained from a more universal explanation. This last approach, ignored even in advanced chemistry textbooks, is valid for real mixtures of gases and the effects start to become verifiable at moderate pressures. Le Chatelier's principle application to pressure variations is explored in the context of the results from the different approaches. (Contains 3 tables.)
Division of Chemical Education of the American Chemical Society. Subscription Department, P.O. Box 1267, Bellmawr, NJ 08099-1267. Tel: 800-691-9846; Tel: 856-931-5825; Fax: 856-931-4115; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A