An iron nail is kept in a tube with a drying agent and no rusting occurs. What does this show?
Question 1 Report
An iron nail is kept in a tube with a drying agent and no rusting occurs. What does this show?
Answer Details
A drying agent absorbs water vapour, so the air inside the tube becomes dry while still containing its usual oxygen. The nail therefore meets oxygen but no water, and no rust forms.
Since only one factor has been removed, the experiment isolates that factor: water is essential for rusting, and taking it away prevents the reaction. This tube is normally compared with one holding boiled water under oil, which removes oxygen instead, so the pair together show both reactants are needed.
The drying agent does not react with the iron itself, temperature has not been altered, and oxygen is still plentiful, which is exactly why the result points to water.
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