o-chem

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Explain whether or not each of the following pairs of solvents might be useful as a solvent pair for recrystallization.
(a) ethanol-methanol (b) hexane-cyclohexane (c) acetone-ethanol
(d) water-ethanol (e) water-cyclohexane

  • o-chem -

    You need to solvents one of which is excellent, the other poorer. So it depends on the solute, but I doubt e solvents both dissolve the same solute. The others will depend on the solute.

  • o-chem -

    and, of course, as DrBob just pointed out to me, e solvents are NOT miscible, which they must be.

  • o-chem -

    thanks. i understand why e won't work, but im a little confused on choice a. they both dissolve a wide range of solutes so would it be a great solvent?

  • o-chem -

    well im confused because you said one needs to be great and the other has to be poor. so if you combine both do you get a great solvent or a horrible one?

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