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ERIC Number: EJ920475
Record Type: Journal
Publication Date: 2010-Nov
Pages: 7
Abstractor: As Provided
Reference Count: 37
ISSN: ISSN-0021-9584
Potentiometric pH Measurements of Acidity Are Approximations, Some More Useful than Others
de Levie, Robert
Journal of Chemical Education, v87 n11 p1188-1194 Nov 2010
A recent article by McCarty and Vitz "demonstrating that it is not true that pH = -log[H+]" is examined critically. Then, the focus shifts to underlying problems with the IUPAC definition of pH. It is shown how the potentiometric method can provide "estimates" of both the IUPAC-defined hydrogen activity "and" the hydrogen ion concentration, using the same assumptions and with similar inherent uncertainties. Moreover, it is argued that the original Sorensen definition of pH as -log[H[superscript+]] is preferable over the current one.
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
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A