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Why is freezing point depressed when a n...

Why is freezing point depressed when a non-volatile solute is added to a solvent ?

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Freezing point is the temperature at which the liquid and solid states of a substance have the same vapour pressure. On adding solute to the solvent, vapour pressure is lowered. Therefore, temperature at which the vapour pressure of solid and liquid phases are equal, is also lowered. Therefore, freezing point is depressed.
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