Question

Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?

• A. $KCl$
• B. $C_6{H}_{12}{O}_6$
• C. $A{l}_2(S{O}_4{)}_3$
• D. $K_{2}S{O}_4$

Answer 1

The correct option is C $A{l}_2(S{O}_4{)}_3$

Of the given 0.10 m aqueous solutions, $A{l}_2(S{O}_4{)}_3$ will exhibit the largest freezing point depression.

The expression for the freezing point depression of the solution is

$\Delta T_f=i{K}_{f}m$

Van't Hoff factor $i$ is highest for $A{l}_2(S{O}_4{)}_3$ which is $5.$ Hence, it will give maximum depression in the freezing point.