Separation techniques- Filtration & Crystallisation Flashcards
1
Q
What does insoluble mean?
A
It is a solid that will not dissolve in a liquid
2
Q
Why is filtration used?
A
It is used separate an insoluble solid from a liquid
3
Q
How do you carry out filtration?
A
- Equipment: filter funnel, filter paper, conical flask
- Pour mixture into filter paper
- The liquid passes through the tiny pores in the filter paper
- The solid material can’t pass through the filter paper so it’s trapped
- Now the liquid is separate from the solid
4
Q
What does soluble mean?
A
It is a solid that will dissolve in a liquid
5
Q
Why is crystallisation used?
A
It is used to separate a soluble solid from a liquid
6
Q
What does the state symbol (aq) mean?
A
It means aqueous (dissolved in water)
7
Q
How to carry out crystallisation?
A
- Gently heat up the solution
- When most of the liquid has evaporated
- Leave it out to dry
- Then you have crystals
Certain chemicals will break down with heat so it is best to let it evaporate naturally.
