filtration and crystallisation Flashcards
1
Q
what are filtration and crystallisation?
A
physical separation techniques
2
Q
what are physical separation techniques used for?
A
mixtures
3
Q
what is filtration used for?
A
separating an insoluble solid from liquid
4
Q
what does insoluble mean?
A
won’t dissolve in liquid
5
Q
what equipment is used for filtration?
A
conical flask, filter, filter paper
6
Q
steps of filtration
A
- pour mixture into filter paper
-liquid passes through tiny pores in filter paper becoming the filtrate
-solid material can’t pass through filter paper and is trapped
-now solid and liquid have been separated
7
Q
when is crystallisation used?
A
to separate a soluble solid from a liquid
8
Q
what does soluble mean?
A
it can dissolve in the liquid
9
Q
what does aqueous mean?
A
dissolved in water
10
Q
steps to crystallisation
A
leave solution for a few days. water evaporates leaving crystals of soluble solid.
11
Q
how can we increase speed of crystallisation?
A
heat our solution to evaporate water but be careful as some chemicals break down when heated
