A 0.100 m MgSO₄ solution has a freezing point of -0.23$\degree$C. What is the van't Hoff factor for this solution? K_f = 1.86$\degree$C/m A) 0.62 B) 1.0 C) 1.2 D) 2.0 E) 4.0

Question

Quizplus · Accepted Answer

ΔTf = Kf * molality * i
i = ΔTf / (Kf * molality)
i = (-0.23°C) / (1.86°C/m * 0.100 mol/kg)
i = 1.24
The van't Hoff factor (i) is approximately 1.2, which suggests that some of the MgSO4 might have dissociated in solution. Therefore, the correct answer is (C).

A 0100 M MgSO4 Solution Has a Freezing Point of -0

A 0100 M MgSO₄ Solution Has a Freezing Point of -0