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  • While diluting a solution of salt in water, a student by mistake added acetone (boiling point 56°C). What technique can be employed to get back the acetone? Justify your choice.

While diluting a solution of salt in water, a student by mistake added acetone (boiling point 56^{\circ}C). What technique can be employed to get back the acetone? Justify your choice.

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Solution:

If we mix two liquids of significant different boiling points, we can separate them by process of distillation.
Generally, this technique is used if difference in boiling point is more than 25^{\circ}C \sim 30^{\circ}C.
Here the difference in boiling point of salty water and acetone is more than 44^{\circ}C.
On heating, the acetone will start boiling and we can collect the vapour and condense it back in acetone liquid.
Finally in the pot, we will left with only salty water.

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