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A pure substance always has a characteristic melting/freezing and boiling/vapor point. For water, the freezing point is at 0 degrees Celsius. Addition of other substances causes the original sustance to have a change in these values. When you add salt in water, the freezing point gets lowered to as low as -20 degrees Celsius. So, salting of roads is done during winter to keep them from freezing.

The released heat of solubility for sodium chloride lower the freezing temperature of ice.

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