Practicals Flashcards
1
Q
[Practical 10]
In recrystallisation, why do you dissolve crystals in the minimum amount of hot water
A
- to ensure the solution formed is saturated
2
Q
[Practical 10]
In recrystallisation why is the solution filtered through a hot filter funnel
A
To remove any insoluble impurities
3
Q
[Practical 10]
Why is the conical flask left to cool to room temperature to allow crystals to reform?
A
- yield would be lower if it is too warm as solubility is higher at a higher temperature
4
Q
[Practical 10]
Why are crystals filtered under pressure using a Büchner funnel?
A
- allows for better drying, air passes through crystals not around them
5
Q
[Practical 10]
Why is cold water poured through the crystals?
A
To wash away soluble impurities
