This
HTML-based presentation provides students with background on
colligative properties in general and freezing point depression in
particular. It includes a procedure for a freezing point depression
experiment in which the molecular mass of a compound is determined.
The module is annotated with images to clarify conceptual points and
a images and a short QuickTime movie to clarify procedural details of
the experiment.
The
"Background" section provides information regarding the colligative
properties and the effects that introducing solute particles into a
solvent has on the boiling point and freezing point of the resulting
solution. An optional, advanced-level layer provides a more
quantitative presentation of the material including a (detailed)
derivation of the freezing point depression and of the boiling point
elevation constants based solely on Raoult's law and the Clausius
Clapeyron equation.
The "Experiment" section refers to the procedure for an experiment in the General Chemistry Laboratory course. It includes some images of the experimental setup and a small QuickTime movie to help students better prepare for the experiment.