Benzoic acid has a melting point of 122.4 degree C whereas beta-naphthol has a m

Question

Benzoic acid has a melting point of 122.4 degree C whereas beta-naphthol has a melting point of 123.0 degree C. You have an unknown sample that is known to be either benzoic acid or beta-naphthol and you observea melting point of 122.1 degree - 122.6 degree C. What is the best next step to take to correctly identify the unknown compound? Take the melting point of the unknown numerous times and compare the average to the known melting points of benzoic acid and beta-naphthol. The experimental melting point of the unknown is closer to that of benzoic acid therefore the unknown must br benzoic acid. Recrystallize the unknown and retake the melting point. Perform a mixed melting point between the unknown and benzoic acid. Which organic solvent would be the best to use for a liquid extraction where the organic layer is on top of the aqueous layer? Dichloromethane (MW 84.93, density = 1.32 g/mL, immiscible in water) Acetone (MW 58.08, density = 0.786 g/mL, misvible in water) Diethyl ether (MW 74.12, density = 0.713 g/mL, immiscible in water) Dioxane (MW 88.11, density = 1.033 g/mL, miscible in water)

Explanation / Answer

31) Recrystalize the unknown and retake the melting point

32) Diethyl ether

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