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Salt helps melt the ice and thus, clear the roads.
Do you know how?
The freezing or melting point of water is about 0 degrees Celsius or 32 degrees Fahrenheit. When temperature drops below the melting point, water molecules bond together to form solid ice. However, when temperature rises above the melting point, the bonds break and the ice melts forming liquid water.

Now, when we add salt or sodium chloride to ice, it lowers the melting point causing solid ice to melt and form liquid even at temperatures below 0 degrees Celsius. Then, the salt dissociates in the liquid water forming sodium and chloride ions. These ions make it harder for liquid water molecules to again bond together and form ice. Hence, the melting ice does not refreeze and thus, helps clear the roads.

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