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2005
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In the Laboratory
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Using Visible Spectrophotometers and pH Measurements To Study Speciation in a Guided-Inquiry Laboratory
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William H. Otto
Department of Environmental and Biological Sciences, University of Maine at Machias, Machias, ME 04654
Cynthia K. Larive, Susan L. Mason, Janet B. Robinson, and Joseph A. Heppert
Department of Chemistry, University of Kansas, Lawrence, KS 66045
James D. Ellis
Department of Teaching and Leadership, University of Kansas, Lawrence, KS 66045
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October 2005
Vol. 82 No. 10
p. 1552
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| Abstract |
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A collective-effort, guided-inquiry laboratory investigation was developed for the second-semester general chemistry laboratory for the purpose of increasing student conceptual understanding of equilibrium and speciation phenomena. This investigation required students to employ the chemical indicator phenol red in phosphate buffer solution, computer interfaced pH probes, and visible spectrophotometers. Through a combination of potentiometric and visible absorption measurements, the students determined the pH conditions that alter equilibrium concentrations of multiple species (colored and transparent) in solution.
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| Supplement |
Detailed instructions for the students, notes for the instructor, and information about the LoggerPro software and the Ocean Optics dip probe spectrophotometers are available.
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 Contents |
Folder JCE2005p1552W, containing JCE2005p1552Wfig1.tif and JCE2005p1552Wfig2.tif
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| More Information |
Citation |
Otto, William H.; Larive, Cynthia K.; Mason, Susan L.; Robinson, Janet B.; Heppert, Joseph A.; Ellis, James D. J. Chem. Educ. 2005 82 1552.
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Keywords |
Acids / Bases; Analytical Chemistry; Collaborative / Cooperative Learning; Dyes / Pigments; Equilibrium; First-Year Undergraduate / General; Hands-On Learning / Manipulatives; Inquiry-Based / Discovery Learning; Laboratory Instruction; pH; UV-Vis Spectroscopy; Water / Water Chemistry
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History |
Created:
Last Updated: |
August 30, 2005
September 8, 2005
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