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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

J. Chem. Educ., 2005, 82 (10), p 1552

DOI: 10.1021/ed082p1552

Publication Date (Web): October 1, 2005

Section:

History, Education, and Documentation

Abstract

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.

Keywords (Audience):

First-Year Undergraduate / General

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Collaborative / Cooperative Learning

Keywords (Subject):

Acids / Bases

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