CHM120H5 Study Guide - Final Guide: Cyclohexene, Molality, Freezing-Point Depression
Document Summary
Determination of a molar mass by freezing point. To determine the identification of an unknown compound chemists must first determine is molar mass1. The purpose of this experiment was to determine the molar mass of the unknown, non-volatile solute while analyzing the changes on the freezing point of a liquid solvent. In this work, the liquid is cooled to its freezing point while measuring for the time and temperature. With this, the moles of the solute can be calculated and this value is used to determine the molar mass of the unknown compound. The identification of the unknown compound"s molar mass was performed according to the procedure given in the lab manual (pages 42-45)1. The experiment was repeated 4 times, once with the pure solvent and three times with various concentrations of the unknown solute. The calculations were performed according to the same procedure1 and are presented in appendix i.