I did the recrystallization of benzoin acid and phenanthrene. Basically just dis

Question

I did the recrystallization of benzoin acid and phenanthrene. Basically just dissolve the impure solid in hot solvent and gravity filter the hot solution, then allow it to cool down to room temperature and finally filter to isolate the product. The final product that came out were impurity. Where does product loss occur in a recrystallization? I did the recrystallization of benzoin acid and phenanthrene. Basically just dissolve the impure solid in hot solvent and gravity filter the hot solution, then allow it to cool down to room temperature and finally filter to isolate the product. The final product that came out were impurity. Where does product loss occur in a recrystallization? I did the recrystallization of benzoin acid and phenanthrene. Basically just dissolve the impure solid in hot solvent and gravity filter the hot solution, then allow it to cool down to room temperature and finally filter to isolate the product. The final product that came out were impurity. Where does product loss occur in a recrystallization?

Explanation / Answer

In the recrystallization of benzoic acid and phenanthrene, dissolving the impure solid in hot solvent dissolves the compounds. Filtering the hot solution, a gravity filtration technique, removes the insoluble impurities from the solution. When we cool it down to room temperature and filter to isolate the product, If we wash the filtered crystals with say a hot solvent, then product will redissolve in the hot solvent added for washing and will go in solution again. such that we would loose the products and only impurity will remain. pl. note you may have missed this washing step from the description above. Another point here is If the solution is not cold enough, the product will not recrystallize from its solution and we will see no product when filtered.

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