Question

define cryoscopic constant with its SI Unit​

Answer 1

Explanation:

Cryoscopic constant is defined as the Molal depression constant Or it may be defined as the depression in freezing point when one mole of non-volatile solute is dissolved in one kilogram of solvent. Its units K Kg mol-1

Answer 2

Answer:

Cryoscopic constant is also called molal freezing point depression constant. It has S.I. unit K kg mol⁻¹.

Explanation:

• Freezing point is defined as the temperature at which the solid and liquid phase of a substance coexist. It may be defined as the temperature at which the solid and the liquid have same vapor pressure.
• As we all know, depression in the freezing point is a colligative property. When a non- volatile solute is added  to a solvent, the freezing point of the solution is always less than that of pure solvent.
• The depression in the freezing point can be calculated from the formula :        

         $\triangle T_{f} = K_{f} m$

where m is the molality of the solution and $K_{f}$ is the molal  freezing point depression constant. It is also called Cryoscopic constant.

• Cryoscopic constant is defined as the depression in the freezing point of 1 molal solution (a solution containing one mole of solute in 1000g of solvent).  The unit of Cryoscopic constant are °C m⁻¹ or K kg mol⁻¹.