Mass Transfer
Blowdown in a cooling tower

Is undesirable
Increases the scale forming tendencies of water
All of these
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities

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Mass Transfer
When the solvent dissolves very little of solute, then

Very small quantity of solvent is required
Large quantity of solvent is required to extract the solute
Solvent of low latent heat of vaporisation should be used
Solvent of low freezing point should be used

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