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Freezing Point Depression

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Pro Tip

Always verify your input values before calculating. For freezing point depression, small input errors can compound and significantly affect the final result.

Difficulty:Intermediate

Did you know?

Road salt (NaCl) works by freezing point depression, but only down to about −9°C. At lower temperatures, CaCl₂ (which gives i=3 and larger ΔTf) is used for de-icing.

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Reviewed May 2026
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