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Answer to Question #43596 in Physical Chemistry for najma

Question #43596
freezing point of pure solvents higher than freezing point solution in which non-volatile solute dissolve justify
Expert's answer
If the solution is treated as an ideal solution, the extent of freezing point depression depends only on the solute concentration that can be estimated by a simple linear relationship with the cryoscopic constant ("Blagden's Law"):
ΔT = i∙b∙Kf
where ΔT is temperature depression, i is the van 't Hoff factor, b is the molality (mol solute per kg of solvent), Kf is the cryoscopic constant.
According to this formula, the freezing point depression linearly increases with increase of the solute concentration.

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