compound water ethanol ethyl acetate cold 25 0 C hot cold 25 0 C hot cold 25 0 C

Question

compound

water

ethanol

ethyl acetate

cold

25 0C

hot

cold

25 0C

hot

cold

25 0C

hot

acetanilide

I

I

PS

S

S

S

S

S

S

sucrose

S

S

S

I

I

I

I

I

I

naphthalene

I

PS

S

I

PS

S

S

S

S

2. Based on the solubility test results, indicate for each compound if there is a suitable solvent for a single-solvent recrystallization and if there are two solvents suitable for a two-solvent recrystallization (briefly explain your reasoning in each case?

Solubility results for the compounds tested (“S” = soluble, PS = partially soluble, “I” = insoluble).  

compound

water

ethanol

ethyl acetate

cold

25 0C

hot

cold

25 0C

hot

cold

25 0C

hot

acetanilide

I

I

PS

S

S

S

S

S

S

sucrose

S

S

S

I

I

I

I

I

I

naphthalene

I

PS

S

I

PS

S

S

S

S

Explanation / Answer

From the given solubility test results, acetanilide completely dissolved in ethanol and ethylacetate under considerable conditions.

Hence, acetanilide can be extracted for a two solvent crystallization by using two solvents. This process is called as multi solvent recrystallization. In this process mixture of two compounds mixtures dissolved in a suitable solvent make into saturation solution. The solution then Allowed to cool. As the solution cools, the solubility of compounds in solution drops.

       This results in the compound dropping I.e recrystallizing from solution. The slower the rate of cooling the bigger the crystals form. Heating is not required for this technique but can be used.

In case of sucrose, it is dissolved in water and insoluble in other solvents. So it can be recrystallized by using single solvent recrystallization technique.

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