Chapter 16, Problem 11STP

Interpretation Introduction

Interpretation : Graph is to be plotted for the data for all three solutes, using molarity as, an independent variable.

Concept Introduction : Molarity is the ratio of moles of a solute to the volume of solution in liter. It is denoted by $\text{M}$ .

The expression for molarity is as follows:

  $\text{M}=\frac{\text{moles of solute}}{\text{Volume of solution(L)}}$

Answer to Problem 11STP

The required graph is plotted as:

  

Explanation of Solution

Molarity mainly explains the concentration of a solute and Freezing point. Depression is a colligative property that decreases with an increase in concertation of the solute. Hence, the Freezing point depression of a solute decreases with an increase in molarity.

The data is given as:

Molarity	Freezing point depression
	$\text{NaCl}$	${\text{CaCl}}_2$	${\text{C}}_2{H}_{6}O$
$0.5$	$1.7$	$2.6$	$0.95$
$1.0$	$3.5$	$5.6$	$2.0$
$1.5$	$5.3$	$8.3$	$3.0$
$2.0$	$7.2$	$11.2$	$4.1$
$2.5$	$9.4$	$14.0$	$5.3$

The required graph is plotted as:

  

Conclusion

The required graph is plotted as: