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The Chemical Educator

ISSN: 1430-4171 (electronic version)

Table of Contents

Abstract Volume 19 (2014) pp 104-105

A Sublimation Experiment with Unknowns

Kate J. Graham*, Abdimahad S. Nur and Chris P. Schaller

Chemistry Department, College of Saint Benedict/Saint John’s University, 37 South College Avenue, St. Joseph, MN 56374,
Received January 16. Accepted January 27, 2014.

Published: 28 March 2014

Abstract. A simple and straightforward sublimation laboratory experiment for the purification of an unknown is presented. This introductory laboratory experiment involves a micro-scale sublimation process. Students purify an unknown from a mixture, determine the identity of their compound with IR and 1H NMR spectroscopy, and comment on the purity of the final sample. The use of unknowns increases students’ individual responsibility and prevents using a partner’s data analysis.

Key Words: Laboratories and Demonstrations; organic chemistry; general chemistry; sublimation

(*) Corresponding author. (E-mail:

Article in PDF format (39 KB) HTML format

Supporting Materials:

Instructor preparation notes with CAS numbers for chemicals, student handouts, experimental procedures with images, and a grading rubric (1.3 MB).

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