Part 1 of 3

Can any more dissolve?

explain

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explain: give reasons and connect them to evidence.

At a steady temperature, an added crystal of the same solute dissolves completely after stirring. Was the solution saturated before you added it? Explain using the observation.

Choose one answerSaturatedUnsaturated

What does the disappearing crystal tell you?

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Scope and sources

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

Saturation at a specified temperature; partial evaporation, cooling, filtration and blotting hydrated crystals from a prepared copper(II) sulfate solution. Primary12.1.3(d),12.4.1(c); bounded support for12.4.2. No salt synthesis, quantitative solubility or purity measurement.

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

Official Cambridge syllabus