How does adding salt affect the freezing point of water?

One of the colligative properties of water is the freezing point depression. A colligative property is a change in the property of water due to some amount of solute. Adding salt will lower down the freezing point of water which means that more heat would be needed to bring the boil to freeze. 

When adding salt, the more you add the freezing point drops. The sodium and chlorine ions from the salt get in the way of the water molecules. This makes it harder for them to be rearranged into crystals. Salt prevents ice from staying solid because it raises the temperature .

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