Question

Define 

1. freezing point 

2. Depression in freezing point.

Answer 1

1. Freezing point is defined as the temperature at which the solid and the liquid states of the substances have the same vapour pressure.

2. When a non volatile solute is added to water at its freezing point, the freezing point of water is lowered from 0°C. The lowering of freezing point of the solvent when a solute is added is called depression in freezing point AT1.

3. ∆T_f = T⁰_f – T_r