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When a crystal was added to the clear solution of its salt…

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When a crystal was added to the clear solution of its salt, the crystal did not dissolve and the solution remained unchanged. This showed that the solution was

A. supersaturated

B. concentrated

C. unsaturated

D. saturated

QUICK ANSWER…

D

DETAILS…

Saturation occurs when the exact amount of solute a solvent can completely dissolve at normal temperature, is present. Any extra addition of this solute will not change the concentration of the solution.

Now for the right answer to the above question:

  1. Option A is incorrect. if the solution was supersaturated, the solution will not remain unchanged, rather, it will crystallize out its excess solutes.
  2. Option B is incorrect. a mere concentrated solution would still have been able to dissolve the crystal.
  3. C is incorrect. if the solution were unsaturated, then the crystal would have dissolved.
  4. D is the correct answer. When the solution is saturated, more solutes will not be dissolved, neither will dissolved solutes crystalize out.

KEY-POINTS…

You may please note these/this:

  • Unsaturated solution would have dissolved some or all of the crystal.
  • Saturated solution will remain unchanged.
  • Supersaturated solution will take it as a seed crystal to induce crystallization of excess solutes out of the solution.

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/ culled from 2015 JAMB-UTME Chemistry past question 29 /

When a crystal was added to the clear solution of its salt... » QuizTablet
When a crystal was added to the clear solution of its salt... » QuizTablet

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