What is meant by rusting ? With labelled diagram describe an activity to find out the conditions under which iron rus
Answers
the red or orange coating that forms on the surface of iron when exposed to air and moisture, consisting chiefly of ferric hydroxide and ferric oxide formed by oxidation.
When iron is exposed to
-moist air
-acid ranged water for a long time
it acquires a brownish coat. This is called rusting of iron.
Activity:
1. Take three test tubes and clean iron nails are placed in each of them.
2. label the test tubes A, B and C.
3. In the test tube A, some water is poured it is corked.
4. In test tube B, boiled distilled water is poured, and about 1 mL of oil is added.
The oil will float on water and prevent the air from dissolving in the water.
5. An hydrous calcium chloride is poured in test tube C and corked.
Anhydrous calcium chloride will absorb the moisture, if any, from the air.
6.leave these tubes for a few days.
Observations:
Nails in test tube A acquire rust because of air and water.
Nails in test tube B do not get rusted because air was prevented from reacting with iron.
Nails in test tube C do not get rusted because of same reason.
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