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Explain Depression of freezing point?

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Explain Depression of freezing point?

Posted by Anusha Subba 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 10 months ago

Freezing point of a substance is the temperature at which the vapour pressure
of the substance in its liquid phase is equal to the vapour pressure in the solid phase.
If the vapour pressure of the solution is equal to the vapour pressure of the pure solid solvent then the solution freezes.
According to Raoult’s law, addition of non-volatile solute decreases the vapour pressure of the solvent and would be equal to that of solid solvent at lower This decreases the freezing point of thesolvent.
The decrease in the freezing point = ΔT_f= T_f– T_f⁰. This is known as depression in freezing point.

T_f⁰ = freezing point of pure solvent

T_f⁰ = freezing point when non-volatile solute is dissolved

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