A student has been given an impure substance for purification. After careful con
ID: 799353 • Letter: A
Question
A student has been given an impure substance for purification. After careful consideration, the student decides to se the method of recrystallization. What should be the characteristics for a good solvent that the student should consider? Identify them by circling those that apply:
A) It should dissolve the compound in a reasonable volume.
B) It cannot react chemically with the compound to be purified.
C) It should either dissolve impurities exceedingly well (so that they remain in solution even when cooled) or not at all (so they can be mechanically moved from the hot solution).
D) Ideally it should have a boiling point lower than melting point of solid to be purified in order to avoid a situation in which the solid melts but does not dissolve.
A student has been given an impure substance for purification. After careful consideration, the student decides to se the method of recrystallization. What should be the characteristics for a good solvent that the student should consider? Identify them by circling those that apply: It should dissolve the compound in a reasonable volume. It cannot react chemically with the compound to be purified. It should either dissolve impurities exceedingly well (so that they remain in solution even when cooled) or not at all (so they can be mechanically moved from the hot solution). Ideally it should have a boiling point lower than melting point of solid to be purified in order to avoid a situation in which the solid melts but does not dissolve.Explanation / Answer
A) -- True. The compound needs to be soluble so that you can make saturated solutions, but not have to use a ton of solvent
B) -- True. It shouldn't react or else you will change the identity of your compound
C) -- True. Also, removing as much impurities as you can helps with the recrystallization process
D) -- False. This answer doesn't really make any sense.
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