Chapter 13, Problem 13.88SP

Interpretation Introduction

Interpretation:

The reason of the decrease in the boiling point of the solution needs to be explained when 1 mL benzene is added to 100 mL of toluene whereas the boiling point of the solution increases when 1 mL of toluene is added to 100 mL of benzene.

Concept introduction:

Colligative properties are the properties that depend on the number of particles present in the solution. Elevation in boiling point, depression in freezing point, lowering in vapor pressure and osmotic pressure are some common examples of colligative properties. Vapor pressure is the pressure which is exerted by vapor on the liquid surface in a closed system when the system is in thermodynamic equilibrium. The temperature at which the vapor pressure becomes equal to the atmospheric pressure is called a boiling point.