C2.1.7 - Checking Purity (.6 Summary)

Question 1

Advantages of TLC over paper chromatography

Answer 1

Quicker/more sensitive so smaller samples allow for more variety
If you scrape a spot you can further analyse that

Question 2

What does a single spot indicate when checking for purity? (chromatography)

Answer 2

That the compound is pure

Question 3

What do multiple spots indicate when checking for purity? (chromatography)

Answer 3

That the compounds are in a mixture and impure

Question 4

Which separation method: Insoluble and Soluble

Answer 4

Dissolving followed by filtration

Question 5

Which separation method: A solution (with solvent + solute)

Answer 5

Crystallisation (solute)
Simple distillation (solvent)

Question 6

Which separation method: 2+ Liquids

Answer 6

Fractional distillation

Question 7

Which separation method: Coloured, soluble substances

Answer 7

Paper chromatography/TLC