. A student performs a crystallization on an impure sample of anthracene. The sa

Question

. A student performs a crystallization on an impure sample of anthracene. The sample weighs 0.5g and contains about 5% impurity. Based on his knowledge of solubility, the student decides to use toluene as the solvent. After crystallization, the cryst als are dried and the final weight is found to be 0.02 g Assume 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 isthe recovery so low?

Explanation / Answer

The solubility of pure anthracene in toluene is less but the solubility of anthracene having impurity is more. Thus, during crystallization, most of the anthracene is being dissolved in toluene and not crystallized. Thus this is the reseaon for very low yield obtained.

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