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ERIC Number: EJ1014531
Record Type: Journal
Publication Date: 2013-May
Pages: 6
Abstractor: As Provided
ISSN: ISSN-0021-9584
Thermodynamics on the Molality Scale
Canagaratna, Sebastian G.; Maheswaran, M.
Journal of Chemical Education, v90 n5 p598-603 May 2013
For physical measurements, the compositions of solutions, especially electrolyte solutions, are expressed in terms of molality rather than mole fractions. The development of the necessary thermodynamic equations directly in terms of molality is not common in textbooks, and the treatment in the literature is not very systematic. We develop a methodical treatment of this topic and define a new reference solution that can be used for solutions whose composition is described in terms of molality. Thermodynamic quantities per mass of solvent appear naturally in the derivation. We discuss how these quantities may be used to analyze experimental data. (Contains 1 figure.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A