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ERIC Number: EJ1031950
Record Type: Journal
Publication Date: 2014-Apr
Pages: 7
Abstractor: As Provided
ISSN: ISSN-0021-9584
General Procedure for the Easy Calculation of pH in an Introductory Course of General or Analytical Chemistry
Cepriá, Gemma; Salvatella, Luis
Journal of Chemical Education, v91 n4 p524–530 Apr 2014
All pH calculations for simple acid-base systems used in introductory courses on general or analytical chemistry can be carried out by using a general procedure requiring the use of predominance diagrams. In particular, the pH is calculated as the sum of an independent term equaling the average pK[subscript a] values of the acids involved in the diagram step and a concentration-dependent value, calculated as the ratio between ?pC (that is, -log C[subscript acid] + log C[subscript base], corresponding to the predominant species involved in the predominance diagram step) and the number of pH-controlling acid-base pairs involved in the diagram step (one or two for conjugate or nonconjugate systems, respectively). A number of acid--base features can be readily explained via this procedure. This methodology can be extended to complexation equilibria.
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