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Is Matter Around Us Pure — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure1 Mark
Question
To obtain a solid from its solution, which technique is better, evaporation or crystallisation?
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Answer

Crystallization is a process that separates a pure solid in the form of its crystals from a solution. Crystallization is better than evaporation because during Evaporation:
  1. Some solids decompose or some, like sugar may get charred on heating to dryness.
  2. Some impurities may remain dissolved in the solution even after.

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