Chem

Part B

Compounds Range Melting point

Naphthalene 72˚C – 82˚C 77.5˚C

Vanillin 69˚C – 85˚C 77˚C

Mixture 57˚C – 72˚C 64˚C

A.

B. I predict that the melting point of the mixed sample will be around the same. I believe it will be around the same because the melting points of the individual compounds are already so closely around the same melting points, plus or minus one degree.

C. I predict that the melting range of the mixed sample will also be about the same of the individual compounds.

E. Yes, our results conformed to the results of the class. The trends of the melting point of the individual compounds were similar to those listed in the lab manual. But the trends for the melting point of he mixture were not similar. This could have been because of technical errors, such as not paying attention to the experiment.

F. If a compound is not pure, the melting point and range of the compound will be much lower than the literature values.

G. There is a negative relationship between the melting point and range of a solid mixture. The melting range of the solid mixture is broader than the melting range of the pure components of the mixture. The melting point of the pure substance will have an exact melting point while the melting point of the mixture will vary.

Part C

A. The number of our unknown is A.

B. Our unknown has a beige color and it looks has an elongated shape like a grain of rice. It looks more like flakes than crystals.

C. On our first trail we had a melting range of 103˚C – 109˚C, and a melting point of 106˚C. On our second trail we had a melting range of 104˚C – 112˚C, and a melting point of 108˚C. We took the average our two reading and got a melting range of 103.5˚C – 110.5˚C, and a melting point of 107˚C.

D. We suspect our unknown compound to be either Anisoin or Acetanilide. We thought these two compounds was our unknown because it had a melting point that was the nearest to ours. We choose both of them because their melting...