Question

A student tests the solubility of an impure compound in a variety of solvents in order...

A student tests the solubility of an impure compound in a variety of solvents in order to
find a suitable solvent for a recrystallization. She made the observations stated in the table
below.Which of the solvents listed would be a good recrystallization solvent for the impure
compound?
Do you see any reason, why you should not trust the data given in the table?

Solvent Solubility of A at 25 C Solubility of A at boiling point
water soluble soluble
methanol soluble insoluble
acetone insoluble insolube
cyclohexane insoluble soluble

Homework Answers

Answer #1

solubility increased with temperature for water, water is undoubtedly the solvent that can be used. since Recrystalization is efficient at the boiling point of the solvent, In cae od methanol with an increase in temperature, it has become insoluble, it can't be used

Same is the case with acetone which is not at all soluble at both conditions of temperature.

Cyclohexne is soluble at boling point and can also be used.

Yes. Nornally with increase in temperature, the solubility of soulte in a solvent is expected to increase. If it does not increase, the behavior is called inverted solubility curve which is observed in vase of methanol.

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