The two samples A and B may be cinnamic acid, urea and benzoic acid respectively. Using standard cinnamic acid, how to distinguish these two compounds quickly by melting point method?

Melting point of cinnamic acid 133℃

Melting point of benzoic acid 122. 13℃

Melting point of urea132.7℃

First, measure the melting points of A and B. If the melting points are only about 122℃, it is determined to be benzoic acid.

If it is about 133℃, add a small amount of cinnamic acid sample to the sample, mix it evenly and then measure the melting point. If the melting point remains unchanged, it is cinnamic acid, and if the melting point decreases, it is urea.

There are also three samples with different tastes. Urea smells like urine, pungent, cinnamic acid smells like cinnamon, and benzoic acid smells slightly, which can assist in judgment.

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