Adding Salt To Ice To Make It Colder. At lower amounts of salt the solution will start to freeze at a higher temperature and gradually get colder as pure ice freezes out leaving a more concentrated solution. It lowers the freezing point of the water making the mixture colder.
When the last drop freezes the temperature will be -6. Salt Lowers the Temperature of Ice Water Adding salt to ice water lowers the temperature from the normal freezing point of water 0 C or 32 F to as low as -21 C or -5 F. At lower amounts of salt the solution will start to freeze at a higher temperature and gradually get colder as pure ice freezes out leaving a more concentrated solution.
If you go camping or on a picnic its still a good idea to add some water and salt to the ice because it will make your beers colder initially which means theyll stay cold longer.
It will not necessarily get to a colder temperature--you can get ice to a colder temperature by putting it in a colder freezer. Now back to your case of adding salt to slush its the same thing. But with a little salt or sugar or anything else will make the ice turn to water at a colder temperature but will not do what you are trying to do. It will not necessarily get to a colder temperature--you can get ice to a colder temperature by putting it in a colder freezer.
