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Visual display of the Diffusion of hydrogen ions in a solution of phenol red across a differentially permeable membrane, and then up a column over one hour

Diffusion of hydrogen ions in a solution of phenol red across a differentially permeable membrane, and then up a column over one hour

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Diffusion of hydrogen ions in a solution of phenol red across a differentially permeable membrane, and then up a column over one hour

Photographer: Clayton, Michael W.
Summary: Photograph

Phenol red (a pH indicator) in an alkaline medium is inside the test tube and acetic acid is in the beaker. The tube is sealed with dialysis tubing. Here we see the consequences of the movement of hydrogen ions through the membrane - the phenol red changes color to yellow at a pH below 7. Note that the phenol red does not move across the membrane.

- File 1

© Board of Regents of the University of Wisconsin System
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https://digital.library.wisc.edu/1711.dl/3GK7B3334T7AQ8R

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Photographer: Clayton, Michael W.
Collections: Botany Collection; University of Wisconsin–Madison Botany Department Teaching Collection
Series: Basic Biological Concepts; Diffusion, osmosis and imbibition
Description of Original: Digital image, jpeg

Subjects

METS