Separating Mixtures. Flashcards
1
Q
How would you separate insoluble and soluble substances?
A
Dissolving followed by filtration.
2
Q
How would you separate a solute dissolved in a solvent (a solution)?
A
Crystallisation to obtain the solute or simple distillation to obtain the solvent.
3
Q
How would you separate two or more substances in the liquid state?
A
Fractional distillation.
4
Q
How would you separate coloured soluble substances?
A
Paper chromatography or thin-layer chromatography.
5
Q
Why is TLC better than paper chromatography?
A
• it is quicker
• it is more sensitive, so a smaller sample can be used
• there is a larger range of stationary phases and solvents to choose from.
You can also scrape an individual spot from a thin-layer chromatogram for further analysis, for example by gas chromatography.
