As the concentration of a solute in a solution increases, the freezing point of the solution and the vapor pressure of the solution .
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As the concentration of a solute in a solution increases, the freezing point of the solution decrease and the vapor pressure of the solution decrease .

Explanation:

Depression in freezing point :

where,

=depression in freezing point =  

= freezing point constant  

m = molality  ( moles per kg of solvent) of the solution

As we can see that from the formula that higher the molality of the solution is directly proportionate to the depression in freezing point which means that:

Relative lowering in vapor pressure of the solution is given by :

= Vapor pressure of pure solvent

 = Vapor pressure of solution

= Mole fraction of solute

Vapor pressure of the solution is inversely proportional to the mole fraction of solute.

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