what is the color changes if FeCl3 added with pure aspirin?

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  1. FeCl3 will not react with aspirin. It will, however, react with salicylic acid, which is used to synthesize aspirin. Thus by adding an aqueous FeCl3 solution to a sample of aspirin is a good way to see if there is any unreacted salicylic acid. A purple colour is an indication of salicylic acid. A sample of pure aspirin should not exhibit a colour change.

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