* Lowering the Freezing Point: Salt lowers the freezing point of water. This means that a salty water solution will need to be colder than pure water to freeze.
* How It Works: When salt is added to ice, it dissolves in the thin layer of water that naturally forms on the surface. This dissolved salt disrupts the formation of the crystal structure that ice needs to stay frozen. The salt ions essentially get in the way, making it harder for water molecules to form the stable ice lattice.
* Practical Applications: This principle is used to melt ice on roads and sidewalks in the winter. The salt lowers the freezing point of the water, preventing it from refreezing even if the temperature is below freezing.
Important Note: While salt does melt ice, it doesn't necessarily make it disappear. The salt actually dissolves into the water, creating a salty solution. This solution can then freeze again if the temperature drops low enough, though the freezing point will be lower than pure water.
