Final answer:
The freezing point depression is directly proportional to the molal concentration of the solute. The equation ATf = Kfm can be used to calculate it.
Step-by-step explanation:
The freezing point depression is directly proportional to the molal concentration of the solute. This means that as the molal concentration of the solute increases, the freezing point of the solution decreases. The equation to calculate the freezing point depression is ATf = Kfm, where ATf is the change in freezing point, Kf is the molal freezing-point depression constant, and m is the molal concentration of the solute.