Adding salt to a solid decreases the freezing point of that solid, and solutes decrease the freezing point or the point of crystallization of water. Given these facts, what is one way to lower the freezing point of water among the following options:
- add a solute
 - purify it
 - Solutions
 - remove impurities
 - Calcium carbonate
 - add water
 - evaporation
 - Dehydration


 

 add a solute        