U4-2-3 - Recrystallisation

Question 1

What is the purpose of recrystallisation?

Answer 1

To purify a solid product.

Question 2

To recrystallise a solid:
* dissolve in minimum volume of hot solvent
* carry out a hot filtration
* ________________
* filter.

Answer 2

To recrystallise a solid:
* dissolve in minimum volume of hot solvent
* carry out a hot filtration
* cool
* filter.

Question 3

To recrystallise a solid:
* dissolve in minimum volume of hot solvent
* carry out a hot filtration
* cool
* ________________.

Answer 3

To recrystallise a solid:
* dissolve in minimum volume of hot solvent
* carry out a hot filtration
* cool
* filter.

Question 4

Recrystallisation:
the solid should be ________________ in chosen solvent at ________________ and only sparingly soluble at lower temperatures.

Answer 4

Recrystallisation:
the solid should be completely soluble in chosen solvent at high temperatures and only sparingly soluble at lower temperatures.

Question 5

To recrystallise a solid:
* dissolve in ________________ of hot solvent
* carry out a hot filtration
* cool
* filter.

Answer 5

To recrystallise a solid:
* dissolve in minimum volume of hot solvent
* carry out a hot filtration
* cool
* filter.

Question 6

To recrystallise a solid:
* dissolve in minimum volume of ________________
* carry out a hot filtration
* cool
* filter.

Answer 6

To recrystallise a solid:
* dissolve in minimum volume of hot solvent
* carry out a hot filtration
* cool
* filter.

Question 7

To recrystallise a solid:
* dissolve in minimum volume of hot solvent
* carry out a ________________
* cool
* filter.

Answer 7

To recrystallise a solid:
* dissolve in minimum volume of hot solvent
* carry out a hot filtration
* cool
* filter.

Question 8

Recrystallisation:
the solid should be completely soluble in chosen solvent at high temperatures and only ________________ at ________________.

Answer 8

Recrystallisation:
the solid should be completely soluble in chosen solvent at high temperatures and only sparingly soluble at lower temperatures.

Question 9

How can filtration be carried out quickly?

Answer 9

Filter under vacuum/reduced pressure

Question 10

Name this piece of equipment

Answer 10

Büchner funnel (used for vacuum filtration)