Question

The use of common salts,e.g., $Nacl$ or $Ca{Cl}_2$ anhydrous, is made to clear snow on the rods.This causes:

• A. A lowering in the freezing point of water.
• B. A lowering in the melting point of ice.
• C. Ice melts at the temperature of atmosphere present at that time.
• D. All of the above.

Answer 1

Answer: (D)

All of the above.

The freezing point of a liquid is that temperature at which the liquid and its solid state exist in equilibrium with each other. It may be defined as the temperature at which the liquid and solid states of a substance have the same vapor pressure.
When a non-volatile non-electrolyte is dissolved in a pure solvent the vapor pressure of the solvent is lowered so addition of non-volatile solutes decreases the freezing point of solution and addition of salt lowers the freezing point of water and thus snow melts.