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Mass Transfer

Q1: When the solvent dissolves very little of solute, then

A solvent of low latent heat of vaporisation should be used.

B solvent of low freezing point should be used.

C large quantity of solvent is required to extract the solute.

D very small quantity of solvent is required.

ANS:C - large quantity of solvent is required to extract the solute.

When the solvent dissolves very little solute, it means that the solubility of the solute in the solvent is low. In such a scenario:

  • Solvent of low latent heat of vaporization should be used: Using a solvent with a low latent heat of vaporization would facilitate the removal of the solvent from the solution during the separation process. Since only a small amount of solute is dissolved, using a solvent with a low latent heat of vaporization would make the evaporation of the solvent more efficient and require less energy.
Therefore, the correct choice would be: solvent of low latent heat of vaporization should be used.



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