The equilibrium constant for bromothymol blue: A general chemistry laboratory experiment using spectroscopy

Elsbeth Klotz; Robert Doyle; Erin Gross; Bruce Mattson

doi:10.1021/ed1007102

The equilibrium constant for bromothymol blue: A general chemistry laboratory experiment using spectroscopy

Elsbeth Klotz, Robert Doyle, Erin Gross, Bruce Mattson

Department of Chemistry

Research output: Contribution to journal › Article

19 Scopus citations

Abstract

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_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) ²⁺ equilibrium.

Original language	English (US)
Pages (from-to)	637-639
Number of pages	3
Journal	Journal of chemical education
Volume	88
Issue number	5
DOIs	https://doi.org/10.1021/ed1007102
State	Published - May 1 2011

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All Science Journal Classification (ASJC) codes

Chemistry(all)
Education

Cite this

Klotz, E., Doyle, R., Gross, E., & Mattson, B. (2011). The equilibrium constant for bromothymol blue: A general chemistry laboratory experiment using spectroscopy. Journal of chemical education, 88(5), 637-639. https://doi.org/10.1021/ed1007102

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Access to Document

10.1021/ed1007102