Chapter 13, Problem 136QGW

Interpretation Introduction

Interpretation: The expected boiling point and freezing point of sugar solution are to be calculated, the deviation of boiling point of syrup and boiling point of pure water is to be explained and also the freezing of syrup at $-{\text{18}}^{\text{o}}\text{C}$ is to be explained.

Concept Introduction: Colligative properties of a solution depend upon the amount of solute present in the solution irrespective of its nature.

They are of 4 types, freezing point depression, boiling point elevation, lowering of vapor pressure and osmotic pressure.

On addition of a non-volatile solute, the physical properties of a pure solvent get altered and extends the temperature range over which it can remain a liquid.

The molality of any solution can be given as:$\text{Molality}(m)= \frac{\text{Moles of solute}}{\text{Kilograms of solvent}}$

The freezing point depression of a solution is given by the expression:$\Delta T_f=m\times K_f$