Question

What is meant by freezing point? In a solution of urea?

Answer 1

When urea is added to water, the freezing point decreases. ... A quick answer starts with the definition of freezing point; it is the point at which the solid phase and the liquid phase exist in equilibrium. The solid phase is more ordered and thus has lower entropy.

Answer 2

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Freezing point depression is a colligative property observed in solutions that results from the introduction of solute molecules to a solvent.

The freezing points of solutions are all lower than that of the pure solvent and is directly proportional to the molality of the solute. ΔTf=Tf(solvent)−Tf(solution)=Kf×m.