Salt increases the boiling point and decreases the melting point of water. That means if you add salt before heating some water on the stove, it will take longer to boil. Also, if you add salt to ice, it will melt faster.
What is the melting point?
Melting point is the temperature at which a given solid material changes from a solid state to a liquid, or melts.
Salt makes water boil at a higher temperature - water sticks to the salt ions, so they can't get out of the liquid as easily.
Salt makes water freeze at a lower temperature - it's probably harder for the water molecules to get organized into a solid-state with all the salt ions messing up its structure.
Hence, as the moles of salt are added melting point of the water increases.
Learn more about the melting point here:
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