Chapter 13, Problem 63QP

Interpretation Introduction

Interpretation:

The molality of givensolution of amino acid glycineis to be calculated.

Concept introduction:

The temperature at which change of liquid state to solid state occurs is called freezing point.

The freezing point depression is as follows:

$\Delta T_{\text{f}}=m\times K_{\text{f}}$

Here, $\Delta T_{\text{f}}$ is the change in temperature of the freezing point in $\text{C}$, $m$ is the molality of the solution, and $K_{\text{f}}$ is themolal freezing point depression constant for the solvent.

For water

$K_{\text{f}}=1.86\frac{\text{C}}{m}$

The actual freezing point is the difference between freezing point of pure solvent and freezing point depression.

$T_f=T_f{}^{°}-\Delta T_{\text{f}}$