The image above represents the freezing point depression.

To compute for the freezing point depression, three essential parameters are needed and these parameters are Van’t Hoff’s Factor (i), cryoscopic constant (K_{f}) and molality.

The formula for calculating freezing point depression:

δT_{f} = iK_{f} x Molality

Where;

δT_{f} = Freezing point depression

i = Van’t Hoff’s Factor

K_{f} = cryoscopic constant

Molality

Let’s solve an example;

Find the freezing point depression when the van’t hoff’s factor is 12, cryoscopic constant is 21 with a molality of 16.

δT_{f} = iK_{f} x Molality

δT_{f} = (12 x 21) x 16

δT_{f} = 252 x 16

δT_{f} = 4032

Therefore, the **freezing point depression** is **4032 °C m ^{-1}.**