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Why does temperature for solutions continue to fall as it freezes, while pure solvent is level?

Why does temperature for solutions continue to fall as it freezes, while pure solvent is level?

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Answer #1

Temperature of pure solvent is entirely dependent upon the solvent-solvent interaction present within the system. On the other hand when we consider a solution, these solvent-solvent interactions becomes less strong due to solute coming between them. This lowers the freezing point. One may also look at it, as melting point of solid. When you add solute and make a solution, the intermolecular solvent-solvent interactions are reduced. So lesser amount of energy is required to melt the solid or lower freezing point of solution results.

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