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Anhydrous ferric chloride (FeCl3) is best prepared by:

1. heating hydrated ferric chloride to a high temperature in a current of air
2. passing dry chlorine gas over heated metallic iron
3. reacting ferric oxide with hydrochloric acid
4. reacting metallic iron with hydrochloric acid

Correct answer: passing dry chlorine gas over heated metallic iron

Solution

Heating iron in dry chlorine directly forms anhydrous FeCl3 (which sublimes and is collected dry); the water-based routes give hydrated salt or hydrolysis products.

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