Chap 1 - Methods of purification Flashcards
Filtration uses
Separate insoluble solid from liquid
How filtration works
Particles smaller than filter paper pass while particles larger than filter paper trapped
When to use filtration
Solid insoluble in liquid
What is Evaporation
Supply heat to remove liquid
Evaporation process
The solute has higher boiling point than solvent âž¡ solvent boils off âž¡ solute leaves
Why Evaporation
To obtain solid form liquid
When to use evaporation
Solute thermally stable and not compose upon heating
What is distillation
Process to separate liquid from a solution of solute
How does distillation works
Boiling a liquid and condense vapour
Why use distillation
Obtain pure solvent from a solution of solvent
When is crystallisation used
When substance decompose when heated strongly
How crystallisation works
The solution is evaporate and sill saturated and allow to cool âž¡ dissolve solid from crystals
What is crystallisation
Method to obtain pure solvent from its solution
What is decomposition
Substance that lose water of crydtallisation
How Fractional distillation works
- Mixture of liquid is heated and it vapourised
- The vapour of higher boiling point condenses on the cool surfaces in the fractionating column and falls back into the flask
- The vapour of a lower point reaches the upper part of the column and is distilled. This vapour passes though the condenser and undergo cooling. It changes to liquid and flows down the liner tube go the condenser
- The liquid collected as distillate in the receiver
