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ERIC Number: EJ936773
Record Type: Journal
Publication Date: 2011-May
Pages: 3
Abstractor: As Provided
Reference Count: 15
ISSN: ISSN-0021-9584
The Equilibrium Constant for Bromothymol Blue: A General Chemistry Laboratory Experiment Using Spectroscopy
Klotz, Elsbeth; Doyle, Robert; Gross, Erin; Mattson, Bruce
Journal of Chemical Education, v88 n5 p637-639 May 2011
A simple, inexpensive, and environmentally friendly undergraduate laboratory experiment is described in which students use visible spectroscopy to determine a numerical value for an equilibrium constant, K[subscript c]. The experiment correlates well with the lecture topic of equilibrium even though the subject of the study is an acid-base indicator, bromothymol blue. The experiment gives excellent results and offers an inexpensive, zero-waste alternative to traditional equilibrium experiments, such as the Fe(SCN)[superscript 2+] equilibrium. (Contains 1 table, 1 figure, 1 scheme, and 2 notes.)
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