How much salt does it take to melt ice?
- None. Salt doesn't melt ice, only adding heat will. Adding salt to ice will lower the freezing point of water so the water will be a liquid near its freezing point (32F)rather than a solid.
That's why you see the salt trucks out before the snowfall. They spread salt or more often "ice melt" in the dangerous areas like stop signs and turns before the event.
The same thing holds true for you at home. Spreading ice melt or placing ice melt filled snow socks, before a snow event, allows the first precipitation to mix with the ice melt crystals and form a flowing liquid deicer. If the liquid is allowed to drain or run-off it will keep a specific area clear of ice dams until the next event.
Salt lowers the freezing point of water, if you add salt to water, it will be harder to turn it into ice. For example, you need to make metal very hot to melt it, however you don't need as much to melt ice. you don't need as much heat to melt salted ice as you do to melt ice. So salted ice melts faster. Salt will melt Ice Salt will dissolve in water Salt melts…