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What compounds are good for demonstrating molar mass determination by freezing point depression?

In the General Chemistry Lab course at my school, there is an experiment called Molar Mass Determination from Freezing Point Depression using t-butyl alcohol. The t-butyl alcohol doesn't work very well in this experiment. Is there another solution that you recommend?
nssep1821@alpha.nsula.edu

A compound with the following properties will work:
  1. High solubility.
  2. Low molecular weight (the lower the molecular weight, the bigger the observed freezing point depression per gram).
  3. A nonelectrolyte (electrolytes don't obey the simple ideal solution freezing point relation).
There are several compounds that meet all three criteria; urea is probably the best. Acetamide, alanine, sorbitol, glucose, and glycine also work well.

Author: Fred Senese senese@antoine.frostburg.edu



General Chemistry Online! What compounds are good for demonstrating molar mass determination by freezing point depression?

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Last Revised 08/17/15.URL: http://antoine.frostburg.edu/chem/senese/101/solutions/faq/good-fp-compounds.shtml