The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L^-1 is 0.0405^° C. Density of formic acid is 1.05 g…

The depression in freezing point observed for a formic acid solution of concentration $\displaystyle 0.5 \mathrm{~mL} \mathrm{~L}^{-1}$ is $\displaystyle 0.0405^{\circ} \mathrm{C}$. Density of formic acid is $\displaystyle 1.05 \mathrm{~g} \mathrm{~mL}^{-1}$. The Van't Hoff factor of the formic acid solution is nearly : (Given for water $\displaystyle \mathrm{k}_{\mathrm{f}}=1.86 \mathrm{k} \mathrm{kg} \mathrm{mol}^{-1}$ )