Question #199662

Derive equation use to calculate depression in freezing point?

Expert's answer

*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.

Δ*Tf*=*T*_{f}_{(}_{solvent}_{)}−*T*_{f}_{(}_{solution}_{)}=*K*_{f}×*m*

where Δ*T*_{f}* *is the freezing point depression,

*T*_{f}_{(solution)} is the freezing point of the solution,

*T*_{f}* *_{(solvent)} is the freezing point of the solvent,

*K*_{f}* *is the freezing point depression constant,

*m* is the molality.

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