Times the morality of our substance. Times I the number of particles a soluble dissociates into. Now we have to be careful with freezing point depression because adding a salute to a pure substance will only decrease the freezing point to a certain extent. Eventually our solvent will become our impurity. Because if we add enough solute, the amount of solute will surpass the amount of solvent. And when that happens, adding an immortal solute will actually make our freezing point rise and our melting point rise.