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Topic: Which solvent is best for crystallization?  (Read 12903 times)

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Offline prncess23

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Which solvent is best for crystallization?
« on: September 14, 2007, 07:49:10 PM »
Hello. I have NO idea how to do the following questions. The solid is listed first, followed by the three solvents.

we have to list out of the three solvent 1) which one is best for crystallization, 2) the solvent in which the compound (solid) is too soluble, and 3) the solvent in which the compound is not sufficiently soluble?

A. Phenanthrene; toluene, 95% ethyl alcohol, water
B. Cholesterol; ether, 95% ethyl alcohol, water
C. Acetaminophen; toluene, 95% ethyl alcohol, water
D. Urea; hexane, 95% ethyl alcohol, water

please help. i am soooo lost.

Offline Sporefrog

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Re: Which solvent is best for crystallization?
« Reply #1 on: September 15, 2007, 01:40:46 AM »
The best solvent for crystallization is the one that does not dissolve the substance completely at room temperature, but will at higher temperature. I do not have time at the moment to look up every individual example, however, so hopefully that will help a little at least.

Offline prncess23

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Re: Which solvent is best for crystallization?
« Reply #2 on: September 15, 2007, 02:34:10 AM »
that's what i thought too, but where can i find that information? Like for example Acetaminophen... how do i know if it is soluble in solvents listed at room temp and at boiling???

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