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2003
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July
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In the Laboratory
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Synthesis of Zinc Iodide Revisited
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Stephen DeMeo
Department of Curriculum and Instruction, Department of Chemistry, Hunter College of the City University of New York, New York, NY 10021
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July 2003
Vol. 80 No. 7
p. 796
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| Abstract |
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Two inquiry-based labs that complement a previously published activity in this Journal, "The Synthesis and Decomposition of Zinc Iodide: Model Reactions for Investigating Chemical Change in the Introductory Laboratory", are described. These two experiments could be of interest to introductory chemistry instructors at the college or high school level who teach their students about limiting and excess stoichiometry as well as acid–base chemistry. The inquiry-based experiments center on alternate reaction pathways involving a second synthesis of zinc iodide and a side reaction that produces zinc hydroxide. In the first experiment, students draw upon their understanding of solubility and molarity to propose a synthesis of zinc iodide from a double replacement reaction involving zinc sulfate and barium iodide. Students compare the double replacement reaction with the elemental synthesis in terms of percentage yield, efficiency, safety, and cost. In the second experiment, students are asked to identify a white precipitate that forms during a synthesis of zinc iodide from its elements when a specific reagent, acetic acid, is not used. By referring to the literature and conducting qualitative tests, students determine that the white product is zinc hydroxide, a base produced from the hydrolysis of zinc ion.
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| Supplement |
Written materials used by students (procedure, qualitative tests, a postlab checklist, pre- and postlab questions), as well as instructor information (comments, list of equipment and chemicals, chemical preparation instructions, and answers to questions posed in the activity) are available.
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 Contents |
JCE2003p0796W.doc (Microsoft Word)
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| Download |
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| More Information |
Citation |
DeMeo, Stephen. J. Chem. Educ. 2003 80 796.
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Keywords |
General Chemistry; Inorganic Chemistry; Inorganic Synthesis; Inquiry-Based / Discovery Method; Introductory / High School Chemistry; Laboratory Instruction; Qualitative Analysis; Stoichiometry
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History |
Created:
Last Updated: |
June 4, 2003
February 28, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
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