Experiment 13. Molecular Weight Determination by Freezing Point Depression. Purpose. The purpose of this experiment is to use the freezing-point depression of a solution of an unknown compound in para-dichlorobenzene (PDB) to determine the molecular weight of the unknown. Introduction.
Molecular Weight Determination by Freezing Point Depression
Vapor pressure over a solution
(kf = -7.10 oC/m)
Moles solute = molality x kg PDB and pour mixture into waste container.