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ERIC Number: EJ1017109
Record Type: Journal
Publication Date: 2013-Jun
Pages: 3
Abstractor: As Provided
ISSN: ISSN-0021-9584
Weak Acid Ionization Constants and the Determination of Weak Acid-Weak Base Reaction Equilibrium Constants in the General Chemistry Laboratory
Nyasulu, Frazier; McMills, Lauren; Barlag, Rebecca
Journal of Chemical Education, v90 n6 p768-770 Jun 2013
A laboratory to determine the equilibrium constants of weak acid negative weak base reactions is described. The equilibrium constants of component reactions when multiplied together equal the numerical value of the equilibrium constant of the summative reaction. The component reactions are weak acid ionization reactions, weak base hydrolysis reactions, and the auto-ionization of water reaction. The summative equations are weak acid negative weak base reactions. The acid ionization constants (K[subscript a]) of HC[subscript 2]H[subscript 3]O[subscript 2], H[subscript 3]PO[subscript 4], H[subscript 2] PO[subscript 4][superscript -], HPO[subscript 4][superscript 2-], and NH[subscript 4][superscript +] are determined from measurements of the pH in buffer solutions with known weak acid and known weak base concentrations, and base hydrolysis constants (K[subscript b]) are determined using K[subscript a] times K[subscript b ]= K[subscript w].
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: High Schools; Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A