Filtration and crystallisation Flashcards
1
Q
What is filtration?
A
- Method of separating mixtures
- Separates insoluble solids from liquids
2
Q
What are the two ways of separating soluble solids from solutions?
A
- Evaporation
- Crystallisation
3
Q
Process of evaporation:
A
- Solution in evaporating dish
- Heat slowly
- Solvent evaporates
- Solution become concentrated
- Crystals form
- Heat until only dry crystals are left
4
Q
When can evaporation be used?
A
- Only if salts don’t decompose when heated.
5
Q
Process of crystallisation:
A
- Solution in evaporating dish
- Heat slowly
- Solvent evaporates
- Solution become concentrated
- Crystals forming
- Remove from heat and let solution cool
- Crystals form and become invaluable
- Filter crystals
- Leave in warm place to dry
6
Q
How can filtration and crystallisation be used to separate rock salt?
A
- Grind
- Dissolve
- Filtering
- Evaporation/Crystallisation
