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Linking Laboratory Experiences to the Real World: The Extraction of Octylphenoxyacetic Acid from Water
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Abstract
A laboratory experiment is presented that links several chemical concepts to the extraction of a water pollutant (octylphenoxyacetic acid, OPC) with a method used in actual research. A known quantity of the sodium salt of the OPC is dissolved in water, transformed to the acid (insoluble) form, and extracted using dichloromethane. These changes can be followed visually owing to conspicuous changes in solution turbidity. The experiment allows students to learn and apply basic experimental techniques such as the use of ordinary laboratory glassware (e.g., cylinders and pipets), analytical balance, a separatory funnel, and rotary evaporator; proper handling and disposal of strong acids and solvents; and the application of concepts such as acid–base reactions, stoichiometry, and solvent polarity. At the same time, it demonstrates a direct application of these concepts to a current research topic.
Keywords (Audience):
High School / Introductory ChemistryKeywords (Domain):
Analytical ChemistryKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
Acids / BasesCiting Articles
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This article has been cited by 4 ACS Journal articles (4 most recent appear below).
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- Received: August 03, 2009
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