Today’s Video of the Day comes from the American Chemical Society’s Reactions series and answers the question: why is salt used to melt ice in the winter?
Salt has saved countless lives by quickly and efficiently melting ice that freezes across roadways during winter snowstorms. But how can a substance that isn’t hot cause ice to melt? Well, when it mixes with water, it breaks up into two separate ions: a sodium ion and a chloride ion. These ions push apart water molecules and prevent them from linking together in a process known as freezing point depression. Essentially, salt lowers the freezing point of water.
By Rory Arnold, Earth.com Staff Writer
Source: American Chemical Society