A 1.  Air is consumed during rusting of steel wool / rust prevention
Materials
Tray, 8 ampoules (5 ml, high) in a BD vacutaine stand, permanent marker, 4 stoppers, 4 pipette tips (yellow), scisoors, plastic pipette, coloured water,
dropper bottle with distilled water, zinc-coated wire (Zn), steel wool extra fine, oxygen.
Experiment
1. Cut-off the broad ends of the pipette tips to let them fit into the ampoules.
2. Fill 4 ampoules with coloured water, put them into a stand.
3. Prepare 4 samples of steel wool (Fe) for transfer into the other 4 ampoules:
....One sample stays dry, the other 3 are soaked with water,
....one of them is clamped by piece of zinc-coated wire (Zn) bended around it.
4. Press the steel wool samples (Fe) into the ampoules,
5. Pierce the 4 stoppers from upside with the 4 pipette tips.
6. Use the stoppers to close the ampoules with the with the steel wool samples tightly.
7. Turn the ampoules upside down.
8. Label them: K (control) for the dry sample, W for the sample with water, Zn for the sample connected with zinc wire and O for the ampoule full of oxygen.
9. Photo 2: Dip the 4 ampoules with steel wool samples into the ampoules with coloured water.
10. Leave them at a warm place for some hours.
Write down your observations, try to explain them.
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back......................first publication: 04.07.2003.....................................last modification: 06.04.2010