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2003
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In the Classroom
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JCE Classroom Activity
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Diffusion of Water through a Differentially Permeable Membrane
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Maria Guadalupe Bertoluzzo, Fabio E. Quattrin, Stella Maris Bertoluzzo, and Ruben Rigatuso
Facultad de Ciencias Bioquímicas y Farmacéuticas, Unr. Suipacha 531-(2000) Rosario, Argentina
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September 2003
Vol. 80 No. 9
p. 1032A
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| Abstract |
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When a solution of potassium hexacyanoferrate(II), K4Fe(CN)6, comes in contact with a solution of copper(II) sulfate, CuSO4, a colloidal precipitate, copper(II) hexacyanoferrate(II), Cu2Fe(CN)6, is formed according to the reaction 2Cu2+(aq) + [Fe(CN)6]4-(aq) → Cu2Fe(CN)6(s). In this Activity, students investigate the process of osmosis through the differentially-permeable membrane formed by this precipitate.
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| Supplement |
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The Activity includes an additional extension in "More Things to Try". Students view red onion cells under a microscope, first in a solution of distilled water and then in a solution of sodium chloride. The two photos show red onion cells in an isotonic solution (top) and in an hypertonic solution (botttom). 
Figure 1. Red onion cells in an isotonic solution.
Figure 2. Red onion cells in an hypertonic solution.
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| More Information |
Citation |
Bertoluzzo, Maria Guadalupe; Quattrin, Fabio E.; Bertoluzzo, Stella Maris; Rigatuso, Ruben. J. Chem. Educ. 2003 80 1032A.
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Keywords |
Diffusion; Mechanisms; Physical Chemistry
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History |
Created:
Last Updated: |
August 4, 2003
February 28, 2005
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1032A
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