How does adding salt to water make the freezing point of water lower?
The bonds of the salt require energy to break, so that the ions of the salt may dissolve in the water. The salt gets this energy from the energy of the water. Since heat is a form of energy, heat from the water is absorbed in an endothermic reaction by the salt and the temperature of the water rapidly cools below its freezing point, while remaining in a constant form, until the molecules are disturbed by an outside force, which then causes the water to finally freeze (an example of an outside force is stirring the aqueous solution). I hope this helps!
