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

Question

Quizplus · Accepted Answer

The formula to calculate the van't Hoff factor (i) is:

i = ΔT°f / (m * Kf)

Where ΔT°f is the freezing point depression, m is the molality, and Kf is the freezing point depression constant for the solvent.

Plugging in the given values:

i = (-0.23°C) / (0.100 mol/kg * 1.86°C/m) = 1.23

However, this calculation assumes that MgSO4 is a completely dissociated solute, which is not entirely accurate. The more accurate van't Hoff factor for MgSO4 is approximately 1.2, which is the choice C.

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