a. The following solvent selection data were collected for impure solid (A):
Solvent-------------Solubility at room temp.-----Solubility when heated--------------------Crystals formed when cooled
Methanol------------Insoluble------------------------Insoluble------------------------------------------(-)
Ethyl acetate-------Insoluble-----------------------Soluble-------------------------------------------very few
Cyclohexane--------Insoluble------------------------Soluble-----------------------------------------many
Toluene--------------Insoluble------------------------Soluble-----------------------------------------very few
Based on these results, what solvent or mixture of solvents might one consider using to recrystalline solid A?
I would choose cyclohexane as a solvent since the solute dissolves in hot solvent and crystals appear when the solvent is cool.
b. The following is for impure solid B.
Solvent---------Solubility at room temp.-----Solubility when heated----------------Crystals formed when cooled
Water------------------Soluble-------------------------------(-)------------------------------------------(-)
Ethanol-----------------Soluble------------------------------(-)-------------------------------------------(-)
Dichloromethane----Insoluble------------------------Insoluble----------------------------------------(-)
Petroleum ether-----Insoluble------------------------Soluble-----------------------------------------very few
Toulene-----------------Insoluble------------------------Soluble-----------------------------------------many
Based on these results, what solvent/mixture of solvents might one consider using to rescystallize B?
I would choose toulene as a solvent since the solute dissolves in hot solvent and crystals appear when the solvent is cool.
Thank you.
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Topic: Recrystallization (Read 6438 times)