Where's the error in this distillation lab?

A student carried out a simple distillation on a compound known to boil at 124C and reported an observed boiling point of 116-117C. Analysis of the product showed that the compound was pure, and a calibration of the thermometer indicated that it was accurate. What procedural error might the student have made in... show more A student carried out a simple distillation on a compound known to boil at 124C and reported an observed boiling point of 116-117C. Analysis of the product showed that the compound was pure, and a calibration of the thermometer indicated that it was accurate. What procedural error might the student have made in setting up the distillation apparatus?

http://en.wikipedia.org/wiki/Distillation
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