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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > February  >
In the Classroom
Melting Point Range and Phase Diagrams- Confusing Laboratory Textbook Descriptions
Kenn E. Harding
Texas A&M University, Department of Chemistry, College Station, TX 77843-3255
Cover
February 1999
Vol. 76 No. 2
p. 224
Abstract
Many organic laboratory textbooks present a confusing discussion of melting point range and purity by using only a standard two-component phase diagram to describe melting point behavior. Such diagrams are inadequate for students to understand observed melting point behavior because the diagram suggests that the melting point range for a nearly pure compound will be wider than for a less pure substance. This paper proposes use of a modified phase diagram as a better tool for students to understand the relationship of observed melting point behavior and a physically correct phase diagram.
More Information
*  Citation
 Harding, Kenn E. J. Chem. Educ. 1999 76 224.
*  Keywords
 Organic Chemistry; Laboratory Instruction; Molecular Properties / Structure; Textbooks; Phase Transitions / Diagrams
*  History
 Created:
Last Updated:		 June 15, 1999
June 22, 2005
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