You are given pure samples of benzoic acid and 1,3,5-tribromobenzene. each sample melts at 122°c. you have an unknown sample that also melts at 122°c. without using tlc, describe a technique you could use to determine if your unknown is benzoic acid, 1,3,5-tribromobenzene or some other solid that melts at 122°c.

Question: You are given pure samples of benzoic acid and 1,3,5-tribromobenzene. each sample melts at 122°c. you have an unknown sample that also melts at 122°c. without using tlc, describe a technique you could use to determine if your unknown is benzoic acid, 1,3,5-tribromobenzene or some other solid that melts at 122°c.

One possible technique to identify an unknown solid that melts at 122°C is to use a mixed melting point method. This method involves mixing a small amount of the unknown with a known sample of either benzoic acid or 1,3,5-tribromobenzene and observing the melting point of the mixture. If the unknown is the same as the known, the mixture will have the same melting point as the pure samples (122°C). However, if the unknown is different from the known, the mixture will have a lower and broader melting point range than the pure samples. For example, if the unknown is mixed with benzoic acid and the melting point drops to 110°C, then the unknown is not benzoic acid. Similarly, if the unknown is mixed with 1,3,5-tribromobenzene and the melting point drops to 115°C, then the unknown is not 1,3,5-tribromobenzene. By using this method, one can eliminate the possibility of the unknown being either benzoic acid or 1,3,5-tribromobenzene and conclude that it is some other solid that melts at 122°C.

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