Question

Which of the following may be good candidates for sublimation as a method of purification? why...

Which of the following may be good candidates for sublimation as a method of purification? why or why not? (Hint: you may want to consult a reference book for some physical data)

Diethyl ether, benzophenone, dichlorofluoromethane, potassium nitrate.

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Answer #1

Dichlorofluoromethane may be a good candidate for purification by sublimation because it has a higher melting point so if the vapor pressure at melting point is high then there is a chance for the compound to undergo sublimation without changing into the liquid phase. Other compounds like Diethyl ether and benzphenone have low melting points so they will melt rather than sublimate. Potassium nitrate is an inorganic compound which does not undergo sublimation but actually crystallizes.

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