In a colligative properties experiment, what is the solvent you are using? Look up the Kf for that substance.

a) Water (Kf = 1.86 °C/m)
b) Ethanol (Kf = 1.99 °C/m)
c) Acetone (Kf = 3.9 °C/m)
d) Benzene (Kf = 5.12 °C/m)