Question Detail

CHM 102 Isolation and Purification of Organic Compounds Objective Question
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Question

When performing a recrystallization, if crystals do not form upon cooling, what might you do?
Options
A Add more solvent and heat again
B Scratch the inside of the flask with a glass rod or seed with a crystal
Correct Answer
C Discard the solution
D Heat to boiling again
Correct Answer

Option B is the correct answer.

Detailed Explanation

Scratching the flask provides nucleation sites for crystal formation. Seeding with a pure crystal of the compound can also induce crystallization.

Hint

Nucleation sites help crystals form.

Question Info

Course: CHM 102
Topic: Isolation and Purification of Organic Compounds
Type: Objective
Difficulty: Not specified
Question 527 of 1999
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