Out of the choices provided, which is the best recrystallizing solvent for resorcinol and why? a....

Out of the choices provided, which is the best recrystallizing solvent for resorcinol and why?

a. Water

b. Petroleum ether

c. Ethanol

Expert Solution

In order to recrystallize any organic compound one has to check the solubility parameter. It should not be soluble at room temperature or lower temperature. We need to check out the solubility in water, petroleum ether and ethanol. As the resorcinol has very good solubility in water at room temperature and cold condition as well and hence water can not be good solvent for the recystalization.

Resorcinol is soluble in ethanol and insoluble in petroleum ether at room temperature so the correct choice of the recrystalization of the resorcinol would not be single solvents as either ethanol or petroleum ether. The combination of the ethanol and the petroleum ether would be the correct choice as ethanol and petroleum ether are miscible in each other.

Recrystaliztion:

Resorcinol (10 g) can be the dissolved in minimum volume of ethanol (5 mL) to clear solution. The petroleum ether was added into it till the solution become slightly turbid. Allow the solution at ice cold temperature for 1h, the white crystaline solid formed can be filtered and washed with petroleum ether to get pure resorcinol crystals.

queen_honey_blossom answered 2 hours ago

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