Describe a procedure to solve the follwoing problem. Below is a solibiility tabl

Question

Describe a procedure to solve the follwoing problem.

Below is a solibiility table for an unknown organic solid. The solid is white with mp of 75C. Which solvent would you use for recrystalization ? Explain your choice

3. Describe a procedure to solve the following problems: a) no crystals are formed when solution reaches room temperature b) oiling out c) presence of colored impurities d) presence of insoluble impurities e) loss of product due to premature crystallization on the fluted filter paper when doing a gravity filtration 4. Below is a solubility table for an unknown organic solid. The solid is white with a ml. of 75 which solvent would you use for recrystallization? Explain your choice. solvent solubility at 25°Csolubility at b.p solvent soluble soluble soluble water 100 °C methanol 65 C acetone partially soluble 56 °C diethyl ether soluble soluble 35 °C

Explanation / Answer

Ans : water

Water must be the suitable solvent for the use of recrystallization of the unknown organic solid. The Boiling point of the solvent must be more than the melting point of the solid , so that it can melt into the solvent before its boiling point is reached.

The solid must also be insoluble in the solvent at room temperature , so that it can be recrystallized easily.

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