September 2018

# An idea to study corrosion: An overhead demonstration

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L.H. Sibley, Ontario

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(Leonard Sibley was key driver to the first ChemEd conference at the University of Waterloo in 1973)

Make an agar-agar gel by heating 300 mL of water to a boil. Stop heating. Stir into the water 2 g of powdered agar-agar. While the gel is still hot, have some Petri dishes ready. Place a straight nail and a bent nail in a Petri dish.

Into a test tube, put some hot gel — about 20 mL — and add 10 mL of KSCN solution (0.1 M). Pour this over the iron nails.

Into a second Petri dish, place three iron nails: one with copper wire wound around it, a second with magnesium ribbon wound around it and a third clean iron nail. Make up another gel solution containing KSCN and pour this into the Petri dish.

Look at these on the overhead over a period of two or three days.

February 1974

Reg Friesen and L.H. Sibley sharing a beer at ChemEd 1975

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