Question

An aqueous solution of NaCl freezes below 273K. Explain the lowering in freezing point of water with the help of suitable diagram.

Answer 1

NaCl will lower the freezing point of water. It will act as a hindrance in the interface between solid and liquid. Thus, it will allow liquid to form but will resist the formation of same amount of solid.

Answer 2

Lowering of freezing point of water:

The lowering of freezing point of water or also known as depression of freezing point is the phenomenon when the freezing point of a solvent drops or reduces much lower than its actual freezing point after the addition of non-volatile solutes.

The solute thus mixed has to be non-volatile and the temperature depression does not depend on the chemical properties of the solute but on its amount that has been mixed. It depends on the molality of the resultant mixture.