Important Relations Concerning Depression in Freezing Point

Important Relations Concerning Depression in Freezing Point

(1) Depression in freezing point is directly proportional to the lowering of vapour pressure.  

(2) 

Where  molal depression constant or cryoscopic constant;  Molality of the solution (i.e., no. of moles of solute per  of the solvent);  Depression in freezing point

(3)   or 

 Where  is molal depression constant and defined as the depression in freezing point produced when 1 mole of the solute is dissolved in  of the solvent.  and  are the weights of solute and solvent and  is the molecular weight of the solute.

(4) 

Where Normal freezing point of the solvent; Latent heat of fusion/g of solvent;  for water is 

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