ERIC Number: EJ936774
Record Type: Journal
Publication Date: 2011-May
Pages: 3
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0021-9584
EISSN: N/A
K[subscript a] and K[subscript b] from pH and Conductivity Measurements: A General Chemistry Laboratory Exercise
Nyasulu, Frazier; Moehring, Michael; Arthasery, Phyllis; Barlag, Rebecca
Journal of Chemical Education, v88 n5 p640-642 May 2011
The acid ionization constant, K[subscript a], of acetic acid and the base ionization constant, K[subscript b], of ammonia are determined easily and rapidly using a datalogger, a pH sensor, and a conductivity sensor. To decrease sample preparation time and to minimize waste, sequential aliquots of a concentrated standard are added to a known volume of water and measurements are made after each addition. In this laboratory exercise, students show that K[subscript a] and K[subscript b] are constants, compare and contrast pH and conductivity approaches, and evaluate how solution components (weak acid alone and weak acid plus conjugate base) affect the results. (Contains 3 tables.)
Descriptors: Chemistry, Science Instruction, Science Laboratories, Scientific Principles, Science Experiments, College Science, Equations (Mathematics)
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: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A