Question

A 05.61 m solution of unknown electrolyte depresses the freezing point of water by ${2.93}^0$C. What is van't Hoff factor for this electrolyte? The freezing point depression constant $\left(K_f\right)$ for water is ${1.86}^0$C kg $mo{l}^{-1}$.

Answer 1

$\Delta T_f=k_f\times molality\times i$

$\Rightarrow 2.93=1.86\times 5.61\times i$

$\Rightarrow i=\frac{2.93}{1.86\times 5.61}=0.28$