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After 45 minutes the potato cylinder in the 0.8 mol dm–3 solution was removed and blue dyeadded to this solution. Some of this blue-stained solution was drawn into a syringe. A dropwas then released, slowly, halfway down a test tube of fresh 0.8 mol dm–3 sucrose solutionas shown in the diagram. The blue drop quickly moved to the surface of the liquid in thetest tube.The density of a solution depends on its concentration. The more concentrated thesolution the greater its density. Explain why the blue drop had a lower density andtherefore moved up. [2 marks]

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