Chemistry crystalization question?

Question

The question is like this:
A student performs a crystallization on an impure sample of biphenyl. The sample weighs 0.5g and contains about 5% impurity. Based on his knowledge of solubility, the student decides to use benzene as the solvent. After crystallization, the crystals are dried and the final weight is found to be 0.02g. Assumes that all steps in the crystallization are performed correctly, there are no spills, and the student lost very little solid on any glassware or in any of the transfers, why is the recovery so low?

Answer 1

The solubility difference between hot and cold solvent was not great enough for this particular combination of solute and solvent.