Purification And Checking Purity Flashcards
1
Q
What are the methods used to check if a substance is pure?
A
paper or thin - layer chromatography
2
Q
What advantages does thin-layer chromatography have over paper chromatography?
A
- Quicker
- More sensitive so a smaller sample can be used
- Larger range of stationary phases and solvents to choose from
3
Q
How do you separate insoluble and soluble substances?
A
dissolving followed by filtration
4
Q
How do you separate a solute dissolved in a solvent?
A
- Crystallisation to obtain the solute
- Simple distillation to obtain the solvent
5
Q
How do you separate 2 or more subsances in the liquid state?
A
fractional distillation
6
Q
How do you separate coloured soluble substances?
A
paper chromatography or thin-layer chromatography
