Which of the following equimolar aqueous solu | vedclass

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(D) The freezing point depression is given by the formula $\Delta T_f = i 	imes K_f 	imes m$. Since the solutions are equimolar ($m$ is constant) an

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$C_6H_{12}O_6$ (Glucose)

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(D) The freezing point depression is given by the formula $\Delta T_f = i 	imes K_f 	imes m$. Since the solutions are equimolar ($m$ is constant) and $K_f$ is a constant for the solvent,the freezing point depression depends on the van't Hoff factor $(i)$. $A$ higher $i$ value leads to a greater depression in the freezing point,which means a lower freezing point. To have the highest freezing point,the solution must have the lowest $i$ value. Calculating $i$ for each: $C_6H_5NH_3Cl ightarrow C_6H_5NH_3^+ + Cl^-$ $(i = 2)$ $Ca(NO_3)_2 ightarrow Ca^{2+} + 2NO_3^-$ $(i = 3)$ $La(NO_3)_3 ightarrow La^{3+} + 3NO_3^-$ $(i = 4)$ $C_6H_{12}O_6$ (Glucose) is a non-electrolyte,so it does not dissociate $(i = 1)$. Since glucose has the lowest $i$ value $(i = 1)$,it will have the minimum depression in freezing point and thus the highest freezing point.

Which of the following equimolar aqueous solutions has the highest freezing point?

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