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Homework Help: Recrystallization in the case of two solvents

  1. Oct 8, 2011 #1
    1. The problem statement, all variables and given/known data

    In point form briefly explain how you would go about recrystallizing a compound very soluble in solvent A at room temperature and sparingly soluble in solven B at the bp of B.

    3. The attempt at a solution
    -Add 1g of compound to a conical flask
    -Add 4ml of solvent B to the conical flask and heat to just below bp
    -To this, add solvent A until compound is barely dissolved.
    -Allow the solution to cool slowly in order for the crystals to grow and filter using Buchner funnel and aspirator.
    -Rinse crystals using cold solvent B.

    I used solvent B first because generally the compund should be sparingly soluble in the solvent at room temp and the compound is very soluble in A.

    I rinsed the crystals in cold solvent B so as to not dissolve the crystals again as the compound is very soluble in A

    Is this correct?
  2. jcsd
  3. Oct 10, 2011 #2
    can anyone help me with this?
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