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Can you explain scientificly why salt water has a lower freezing point than plain water?

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Can you explain scientificly why salt water has a lower freezing point than plain water?

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Impurities (in this case salt) will result in a lower freezing point and FYI, a higher boiling point. When the temperature of salt water is lowered, the molecules within in will lose energy and hence come closer together to try to form the hydrogen bonding required for ice. However, as impurities (salt) are in the way, they need to lose more energy so as to create the necesssary bonding. Hence the lower freezing point. A similar concept applies for its boiling point.

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