Recrystallization in the case of two solvents

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SUMMARY

The discussion focuses on the recrystallization process for a compound that is very soluble in solvent A at room temperature and sparingly soluble in solvent B at its boiling point. The proposed method involves adding 1g of the compound to a conical flask, followed by 4ml of solvent B heated just below its boiling point, and then adding solvent A until the compound is barely dissolved. After cooling the solution to promote crystal growth, the crystals are filtered using a Buchner funnel and rinsed with cold solvent B to prevent redissolution.

PREREQUISITES
  • Understanding of recrystallization techniques
  • Familiarity with solubility principles in organic chemistry
  • Knowledge of using a Buchner funnel for filtration
  • Basic laboratory skills including heating and cooling solutions
NEXT STEPS
  • Research the principles of solubility and temperature effects on recrystallization
  • Learn about different solvent pairs for recrystallization
  • Study the use of Buchner funnels in laboratory filtration techniques
  • Explore methods for optimizing crystal growth in recrystallization
USEFUL FOR

Chemistry students, laboratory technicians, and researchers involved in organic synthesis and purification processes will benefit from this discussion.

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Homework Statement



In point form briefly explain how you would go about recrystallizing a compound very soluble in solvent A at room temperature and sparingly soluble in solven B at the bp of B.




The Attempt at a Solution


-Add 1g of compound to a conical flask
-Add 4ml of solvent B to the conical flask and heat to just below bp
-To this, add solvent A until compound is barely dissolved.
-Allow the solution to cool slowly in order for the crystals to grow and filter using Buchner funnel and aspirator.
-Rinse crystals using cold solvent B.

I used solvent B first because generally the compund should be sparingly soluble in the solvent at room temp and the compound is very soluble in A.

I rinsed the crystals in cold solvent B so as to not dissolve the crystals again as the compound is very soluble in A

Is this correct?
 
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