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pdf of presentation slides.
This demonstration of the charge in soil solutions uses a 9V battery. The demo is adaptable to any educational setting (level or activity type). Attach wires (or paperclips) to both leads on the battery and dip them into a soil paste (mixture of soil and water). One lead will collect more clay than the other (shown by wiping each lead on a paper towel after), reflecting the valence state of the soil solution.

File 34203 is a 382kB Acrobat (PDF)
Uploaded: May31 12
Last Modified: 2012-06-01 11:41:11
http://d32ogoqmya1dw8.cloudfront.net/files/NAGTWorkshops/environmental/workshop12/its_electric.pdf

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Cynthia M. Fadem
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