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How can salt melt ice?

Updated: 8/16/2019
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Wiki User

13y ago

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  • The freezing point of water is 0 degrees Centigrade (32 degrees Fahrenheit). More accurately, 0 degrees is the point at which water is melting at the same rate it is freezing, creating a balance. At 0 degrees, water molecules are moving very slowly, and a solid begins to form out of the water, which is ice. When the water has reached an equilibrium at 0 degrees, the ice, undisturbed, will remain ice. If any foreign substance is added to the ice like salt, the water molecules can't attach to form ice as quickly, and so the freezing point (or ice formation rate) is lowered, while the melting rate is unaffected. So ice is forming less quickly, with the salt disturbing the process, and melting is continuing. Because of the lower freezing point, the rate of melting has continued, while the rate of freezing has slowed. So water begins melting before it can form more ice.
  • Any foreign substance can disturb the equilibrium of melting and freezing water molecules at 0 degrees Centigrade. Alcohol and sugar, among many other common substances, will have the same affect. Salt is used to help melt ice on roadways because it is cheap and abundant.

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13y ago
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14y ago

Salt water has a lower freezing point that plain water. Adding salt to ice will lower the freezing point of the ice and effectively melt the ice, at least down to a certain temperature. Notes seem to indicate that the minimum temperature for a saltwater solution is -21.1°C, below which adding salt to the ice would be ineffective.

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