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The Chemical Educator

ISSN: 1430-4171 (electronic version)

Table of Contents

Abstract Volume 18 (2013) pp 203-208
DOI 10.1007/s00897132500

True Melting Point Determination

John C. O’C. Young

Department of Chemistry, Saint Mary’s University, Halifax, Nova Scotia, Canada, B3H 3C3,
Received May 17, 2013. Accepted June 21, 2013.

Published: 19 July 2013

Abstract. While pure compounds melt isothermally at constant pressure, their melting points are commonly reported as the range between the temperatures recorded by a heated capillary-type melting range measuring instrument at the onset and at the completion of melting of a sample as determined by a pharmacopeiac test protocol. Based on the use of a simple, low-cost version of this type of instrument, a procedure is presented and exemplified for determining the true “thermodynamic” melting points of pure compounds from such melting range data.

Key Words: Laboratories and Demonstrations; physical chemistry; laboratory instrumentation

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