Concept explainers
Interpretation:
The role of water in the corrosion of iron is to be explained.
Concept introduction:
The corrosion of iron under the action of air and water is called rusting. It converts iron into its oxides which are powdery and brittle.

Answer to Problem 69A
Water acts as a medium for the iron and oxygen to react and as a catalyst in the reaction.
Explanation of Solution
The following reactions are crucial in the formation of rust:
These reactions can occur in the presence of water only therefore water is essential for rust formation.
The role of water in the formation of rust has been explained.
Chapter 20 Solutions
Chemistry: Matter and Change
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