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CAIE IGCSE Chemistry: Separation & Purification Techniques Question Bank

Practise selecting separation and purification methods from solubility, state, boiling point and reaction-product information.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • select filtration when an insoluble precipitate forms in an aqueous reaction mixture
  • use solubility data in water and xylene to order dissolving, filtering and crystallising
  • link fractional distillation to liquids or gases with different boiling points

12.4.2—Suggest suitable separation and question 1

[Maximum number: 1]

Lead(II) iodide is formed as a precipitate in the reaction shown.

Pb(NO3)2(aq)+2NaI(aq)→PbI2( s)+2NaNO3(aq)\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+2 \mathrm{NaI}(\mathrm{aq}) \rightarrow \mathrm{PbI}_{2}(\mathrm{~s})+2 \mathrm{NaNO}_{3}(\mathrm{aq})

Which method is used to separate the lead(II) iodide from the mixture?

A

crystallisation

B

distillation

C

evaporation

D

filtration

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