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When you treat FeCl3 to aspirin that is boiled in hot water, you will observe a...

When you treat FeCl3 to aspirin that is boiled in hot water, you will observe a colored complex, but no change in color when treated with pure aspirin. What is your logic behind this difference? Write the chemical reaction involved.

[I think the coloration indicates the presence of salicylic acid, but I'm not sure. Please explain fully and give correct answer for a good rating.]

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Answer #1

During preparation of aspirin, some amount of salicylic acid remain there and salicylic acid contain phenolic group which form colored complex with FeCl3. Whereas pure aspirin don't contain any salicylic acid and thus phenolic group is absent and no color is obtained.

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