A student dissolved $20\text{ g}$ of salt in $100\text{ mL}$ of water. How can pure solid salt be recovered…

A student dissolved $20\text{ g}$ of salt in $100\text{ mL}$ of water. How can pure solid salt be recovered from this solution?
  1. By filtering through filter paper
  2. By evaporating the water completely
  3. By freezing the solution solid
  4. By leaving the solution undisturbed overnight

Solution

Dissolving salt is a reversible physical change; evaporating the solvent (water) leaves behind the original solute (salt).

Asked in: Homi Bhabha Practice

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