What are the units for freezing point?

Kf is the molal freezing point depression constant of the solvent (1.86 °C/m for water). m = molality = moles of solute per kilogram of solvent.

What is molal freezing point constant?

The proportionality constant, Kf, is called the molal freezing-point depression constant. For water, the value of Kf is −1.86oC/m. So, the freezing temperature of a 1-molal aqueous solution of any nonvolatile molecular solute is −1.86oC.

How do you find the freezing point constant of molal?

The freezing point depression ∆T = KF·m where KF is the molal freezing point depression constant and m is the molality of the solute. Rearrangement gives: mol solute = (m) x (kg solvent) where kg of solvent is the mass of the solvent (lauric acid) in the mixture. This gives the moles of the solute.

Is freezing point depression in Kelvin?

A solution will solidfy (freeze) at a lower temperature than the pure solvent. This is the colligative property called freezing point depression. Δt is the temperature change from the pure solvent’s freezing point to the freezing point of the solution….Freezing Point Depression.

How do you calculate the freezing point of a solution?

Water has a freezing point depression constant of 1.86. Plug your values into the following equation to calculate the new freezing point of your solution: Freezing point = old freezing point – K x molality. Our water example would look like this:

What is the freezing point formula?

The formula for calculating the change in freezing point is ΔT f = mK f where ΔT f is the change in the freezing point temperature, m is the molality and K f is the freezing point constant (1.853˚C Kg/mol for water).

What is the freezing point depression constant?

The freezing point of a solution is lower than the freezing point of the pure solvent. This phenomenon is referred to as freezing point depression. Tfo is the freezing point of the pure solvent. Tf is the freezing point of the solution. Kf is the molal freezing point depression constant, which has a characteristic value for a given solvent.

How do you calculate freezing point depression?

Calculate the depression of the freezing point using the formula Tf = (i x Kf x m), where Tf is the how much the freezing point drops in degrees Celsius .