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How to collect main batch of crystals using vacuum filtration (Set-up, things to remember) • Why use small amounts of cold water for washing? What is being washed away (2 things)?

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter4: Recrystallization

Section: Chapter Questions

Problem 6Q

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Question

1. How to collect main batch of crystals using vacuum filtration (Set-up, things to remember)
• Why use small amounts of cold water for washing? What is being washed away (2
things)?
2. Why measure the volume of mother liquor in a graduated cylinder?
3. How to let the main batch of crystals dry/how will they be stored until next week?
4. How to collect the small amount of crystals from step 4 (those that were not subjected to
crystallization)
• What can we expect of this small batch of crystals compared to the main batch?

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