Solutions

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