Deciding the best recrystallization solvent for a molecule is sometimes tricky,

Question

Deciding the best recrystallization solvent for a molecule is sometimes tricky, since the compound must dissolve in the solvent, but not too much (or it will not recrystallize out) and not too little, or it will not dissolve in the solvent even when hot. A fairly simple guideline, however, is that If the intermolecular forces are very different between solute and solvent then the solubility will be low at all temperatures and recrystallization will not be possible., Taking that into account, decide which solvent, ethanol or toluene, would be best for recrystallization of naphthoic acid and anthracene, and give a brief explanation for your choice in terms of intermolecular forces.

Explanation / Answer

for napthoic acid bnst solvent will be ethanol. because ethanol is a polar solvent and oulene is a non polar since ethanol is polar it has an intermolecular interaction with napthoic acid alcoholic oh will have the interaction with the acid OH so solubiliy is possille in solvent

For anthracene the best solvent will be toulene since it both are non polar so best solvent will, be toulene

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