The freezing point depression formula is ΔTf = Kf ·m, where ΔTf is the freezing point depression, Kf is the cryoscopic constant, and m is the molality of the solution.
The temperature when a liquid changes into a solid is known as the freezing point.. It is the temperature at which the molecules of the liquid become less active and form a solid structure. For a given substance, the freezing point is usually the same as the melting point, the temperature at which a solid changes to a liquid.Other substances have different freezing points; for example, oxygen freezes at -218°C (-361°F) and hydrogen at -259°C (-434°F). Freezing point is an important concept in the study of thermodynamics, as it is the point at which the energy of a system changes form and the phase of the substance changes.
ΔTf is the difference between the freezing point of the pure solvent and the freezing point of the solution. Kf is the change in freezing point per mole of solute. m is the number of moles of solute per kilogram of solvent.
In other words, the freezing point depression formula can be used to calculate the freezing point of a solution based on the freezing point of the pure solvent and the molality of the solute.
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