Part 3 of 4

How can the salt return?

Suggest / Explain

Try it yourself

Suggest: apply what you know to this case. Explain: give reasons and connect them to evidence.

A and B form a dry mixture. Neither reacts with the candidate liquids; paper retains undissolved B. Water dissolves only A. J dissolves both. Choose a liquid for dissolving and filtering, then explain your choice.

Choose one answer1.Water2.J3.Both work equally well4.Neither can work

Explain what happens to A and B with your choice, and why J fails to split them.

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Scope and sources

Cambridge IGCSE Chemistry 0620 · 2026–2028 v2 · Original learning materials.

Solvent, solute, solution, residue and filtrate; selective dissolution, filtration and bounded method choice. The experiment includes magnetic collection and salt recovery. Saturation, full crystallisation, distillation and chromatography need later lessons.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus