Freezing Point / Boiling Point 

Another useful calculation involving solutions is the change in freezing point and boiling point. Think of the antifreeze/coolant you put into your car. When you add antifreeze, you change the freezing point of water by lowering it. Likewise, when you add coolant, you are increasing the boiling point. The amount you change the freezing point or boiling point depends upon two things: molality and the freezing point depression or boiling point elevation for the solvent. In the freezing point / boiling point changes section, you will see a list of some common solvents with their freezing point, boiling point, freezing point depression, and boiling point elevation. Locate water and notice the freezing point depression and the boiling point elevation. The freezing point of water is 0 degrees Celsius. The boiling point of water is 100 degrees Celsius. For every 1 molal change to the solution, the freezing point of water will drop 1.86 degrees Celsius. Also, the boiling point will rise by 0.51 degrees Celsius. For a 1 molal change to a water solution, the new freezing point will drop to -1.86 degrees and the boiling point will rise to 100.51 degrees.
